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Claviformispora gen.nov. from Phyllostachys heteroclada 1
Morpho-molecular diversity of Linocarpaceae
(Chaetosphaeriales): Claviformispora gen. nov. from
decaying branches of Phyllostachys heteroclada
Xiu-Lan Xu1,2,3, Chun-Lin Yang2,3, Rajesh Jeewon4,
Dhanushka N. Wanasinghe5, Ying-Gao Liu2,3, Qian-Gang Xiao1
1 Research Institute of Forestry, Chengdu Academy of Agricultural and Forestry Sciences, Nongke Road 200,
Chengdu 611130, China 2 National Forestry and Grassland Administration Key Laboratory of Forest Resources
Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, Sichuan Agricultural Univer-
sity, Wenjiang District, Huiming Road 211, Chengdu 611130, China 3 Sichuan Province Key Laboratory of
Ecological Forestry Engineering on the Upper Reaches of the Yangtze River, Sichuan Agricultural University,
Wenjiang District, Huiming Road 211, Chengdu 611130, China 4 Department of Health Sciences, Faculty
of Science, University of Mauritius, Reduit, Mauritius 5 Key Laboratory for Plant Diversity and Biogeography
of East Asia, Kunming Institute of Botany, Chinese Academy of Science, Kunming 650201, Yunnan, China
Corresponding author: Xiu-Lan Xu (xuxiulanxxl@126.com); Chun-Lin Yang (yangcl0121@163.com)
Academic editor: N. Wijayawardene|Received13 May 2020|Accepted 14 June 2020|Published 16 July2020
Citation: Xu X-L, Yang C-L, Jeewon R, Wanasinghe DN, Liu Y-G, Xiao Q-G (2020) Morpho-molecular diversity
of Linocarpaceae (Chaetosphaeriales): Claviformispora gen. nov. from decaying branches of Phyllostachys heteroclada.
MycoKeys 70: 1–17. https://doi.org/10.3897/mycokeys.70.54231
Abstract
In this paper, Claviformispora gen. nov. in Linocarpaceae is introduced from Phyllostachys heteroclada in
Sichuan Province, China. e new genus is characterised by its distinct morphological characters, such as
ostiole with periphyses, asci with a thick doughnut-shaped, J- apical ring and clavate ascospore without
septum-like band and appendage. Maximum Likelihood and Bayesian Inference phylogenetic analyses,
based on DNA sequence data from ITS, LSU, SSU and TEF-1α regions, provide further evidence that
the fungus is a distinct genus within this family. e new genus is compared with similar genera, such as
Linocarpon and Neolinocarpon. Descriptions, illustrations and notes are provided for the new taxon.
Keywords
bambusicolous fungi, one new genus and species, phylogeny, taxonomy
Copyright Xiu-Lan Xu et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0),
which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
MycoKeys 70: 1–17 (2020)
doi: 10.3897/mycokeys.70.54231
http://mycokeys.pensoft.net
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RESEARCH ARTICLE
Xiu-Lan Xu et al. / MycoKeys 70: 1–17 (2020)
2
Introduction
e order Chaetosphaeriales Huhndorf, A.N. Mill. & F.A. Fernández (Sordariomy-
cetes) was introduced in Sordariomycetidae O.E. Erikss. & Winka, based on LSU se-
quence data (Huhndorf et al. 2004) and currently comprises four families viz. Chaeto-
sphaeriaceae Réblová, M.E. Barr & Samuels, Helminthosphaeriaceae Samuels, Cand.
& Magni, Leptosporellaceae S. Konta & K.D. Hyde and Linocarpaceae S. Konta &
K.D. Hyde (Hongsanan et al. 2017; Konta et al. 2017; Wijayawardene et al. 2020).
Recently, 43 genera were accepted within Chaetosphaeriaceae and seven genera within
Helminthosphaeriaceae (Hyde et al. 2020; Wijayawardene et al. 2020). Based on mor-
phology and combined analyses of ITS and LSU sequence data, Konta et al. (2017)
accommodated Linocarpon Syd. & P. Syd. and Neolinocarpon K.D. Hyde in Linocar-
paceae and Leptosporella Penz. & Sacc. in Leptosporellaceae. Leptosporellaceae and
Linocarpaceae are morphologically similar in their dome-shaped ascomata and liform
ascospores (Hyde and Alias 1999; Cai et al. 2004; Konta et al. 2017). e former,
however, can be delineated based on ascospores that are narrow, long liform, with
gradually tapering ends and indistinct mucilage (if present), whereas in Linocarpaceae,
ascospores have a distinct appendage at the apex and are generally wider and dier in
appearance at the ends (Konta et al. 2017).
e genus Leptosporella was introduced with L. gregaria Penz. & Sacc., 1897 as the
type species by Penzig and Saccardo (1897). Lumbsch and Huhndorf (2010) referred it
in Sordariomycetidae genera incertae sedis. Subsequently, the genus was referred to the
Chaetosphaeriales, based on phylogenetic analysis of LSU sequence data (Huhndorf
and Miller 2011; Dai et al. 2016; Wijayawardene et al. 2020). At present, 15 epithets
of Leptosporella are recorded in Index Fungorum (http://www.speciesfungorum.org/
Names/Names.asp). Sydow and Sydow (1917) introduced Linocarpon with L. pandani
Syd. & P. Syd., 1917 as the type species. Hyde (1992a) introduced Neolinocarpon to
accommodate a linocarpon-like species, N. globosicarpum K.D. Hyde, 1992. Currently
in Index Fungorum (2020), 44 and 13 epithets are accommodated in Linocarpon and
Neolinocarpon, respectively. Hyde (1997) and Jeewon et al. (2003) reported that Li-
nocarpon and Neolinocarpon can be accommodated in Hyponectriaceae (Xylariales),
while Bahl (2006) suggested a closer relationship with Chaetosphaeriales and Xylari-
ales, based on their molecular data. However, with more taxon sampling and fresh col-
lections, Konta et al. (2017) conrmed that Linocarpon and Neolinocarpon should be
accommodated in a distinct family (Linocarpaceae) in Chaetosphaeriales.
e present research is a part of our investigations on the taxonomic and phyloge-
netic circumscriptions of pathogenic and saprobic micro-fungi associated with bamboo
in Sichuan Province, China. In this paper, we introduce a new genus Claviformispora in
Linocarpaceae, typied by C. phyllostachydis from Phyllostachys heteroclada Oliv., 1894
(Poaceae). e morphological dierences and analyses of a combined ITS, LSU, SSU
and TEF-1α sequence dataset support the validity of the new genus and its placement
in Linocarpaceae. e new genus is compared with other genera in the family. e
comprehensive descriptions and micrographs of new taxa are provided.
Claviformispora gen.nov. from Phyllostachys heteroclada 3
Materials and methods
Specimen collection and morphological study
Bamboo materials were collected from Ya’an City, China. Single ascospore isolations
were carried out following the method described by Chomnunti et al. (2014) and
the germinating spores were transferred to PDA, incubated at 25 °C in the dark and
cultural characteristics were determined. Ascomata were observed and photographed
using a dissecting microscope NVT-GG (Shanghai Advanced Photoelectric Technol-
ogy Co. Ltd, China) matched to a VS-800C micro-digital camera (Shenzhen Weish-
en Times Technology Co. Ltd., China). e anatomical details were visualised using
Nikon ECLIPSE Ni compound microscope tted to a Canon 600D digital camera
and an OPTEC BK-DM320 microscope matched to a VS-800C micro-digital camera
(Shenzhen Weishen Times Technology Co. Ltd., China). Iodine reaction of the ascus
wall was tested in Melzer’s reagent (MLZ). Lactate cotton blue reagent was used to
observe the number of septa. e gelatinous appendage was observed in Black Indian
ink. Type specimens were deposited at the Herbarium of Sichuan Agricultural Univer-
sity, Chengdu, China (SICAU) and Mae Fah Luang University Herbarium (MFLU).
e ex-type living cultures are deposited at the Culture Collection in Sichuan Agricul-
tural University (SICAUCC) and the Culture Collection at Mae Fah Luang Univer-
sity (MFLUCC). Index Fungorum numbers (http://www.indexfungorum.org/Names/
Names.asp) are registered and provided.
DNA extraction, PCR amplification and DNA sequencing
Total genomic DNA was extracted from mycelium that were grown on PDA at 25 °C
for two weeks using a Plant Genomic DNA extraction kit (Tiangen, China) following
the manufacturer’s instructions. e primers pairs LR0R and LR5 (Vilgalys and Hester
1990), NS1 and NS4, ITS5 and ITS4 (White et al. 1990), EF1-983F and EF1-2218R
(Rehner 2001) were used for the amplication of the partial large subunit nuclear
rDNA (LSU), the partial small subunit nuclear rDNA (SSU), internal transcribed
spacers (ITS) and translation elongation factor 1-alpha (TEF-1α), respectively.
Polymerase chain reaction (PCR) was performed in 25 µl nal volumes contain-
ing 22 µl of Master Mix (Beijing TsingKe Biotech Co. Ltd.), 1 µl of DNA tem-
plate, 1µl of each forward and reverse primers (10 µM). e PCR thermal cycle
programmes for LSU, SSU, ITS and TEF1-α gene were amplied as: initial dena-
turation 94 °C for 3 minutes, followed by 35 cycles of denaturation at 94 °C for
30 seconds, annealing at 55 °C for 50 seconds, elongation at 72 °C for 1 minute
and nal extension at 72°C for 10 minutes. PCR products were sequenced with
the above-mentioned primers at TsingKe Biological Technology Co. Ltd, Chengdu,
China. e newly-generated sequences from the LSU, SSU, TEF-1α and ITS regions
were deposited in GenBank (Table 1).
Xiu-Lan Xu et al. / MycoKeys 70: 1–17 (2020)
4
Table 1. Molecular data used in this study and GenBank accession numbers.
Species name Strain GenBank accession number
LSU ITS SSU TEF
Chloridium aquaticum MFLUCC 11-0212 MH476567 MH476570 MH476573 –
Chloridium aseptatum MFLUCC 11-0216 MH476568 NR_158365 MH476574 –
Claviformispora phyllostachydis SICAUCC 16-0004 MT232720 MT232736 MT232735 MT240855
Cryptophiale hamulata MFLUCC 18-0098 MG386756 – MG386757 –
Cryptophiale udagawae MFLUCC 18-0422 MH758211 MH758198 MH758205 –
MFLUCC 18-0428 MH758210 MH758197 MH758204 –
Dictyochaeta siamensis MFLUCC 15-0614 KX609952 KX609955 – –
Dictyochaeta assamica CBS 242.66 MH870426 MH858788 – –
Dictyochaeta pandanicola MFLUCC 17-0563 MH376710 MH388338 MH388307 MH388373
Dictyochaeta terminalis GZCC 18-0085 MN104624 MN104613 MN104633 –
Echinosphaeria canescens SMH4666 KF765605 – – –
SMH4791 AY436403 – – –
Endophragmiella dimorphospora FMR_12150 KY853502 KY853442 HF937351 –
Gelasinospora tetrasperma CBS 178.33 DQ470980 NR_077163 DQ471032 DQ471103
Helminthosphaeria clavariarum SMH4609 AY346283 – – –
Hilberina caudata SMH1542 KF765615 – – –
Infundibulomyces cupulata BCC11929 EF113979 EF113976 EF113982 –
Infundibulomyces oblongisporus BCC13400 EF113980 EF113977 EF113983 –
Kionochaeta castaneae GZCC 18-0025 MN104621 MN104610 MN104630 –
Kionochaeta microspora GZCC 18-0036 MN104618 MN104607 MN104627 –
Leptosporella arengae MFLUCC 15-0330 MG272246 MG272255 MG366594 MG272259
Leptosporella bambusae MFLUCC 12-0846 KU863122 KU940134 – –
Leptosporella cocois MFLUCC 15-0816 – MG272256 – –
Leptosporella gregaria SMH4290 AY346290 – – –
SMH4673 HM171287 – – –
Leptosporella elaeidis MFLU 19-0669 MK659772 MK659767 MK659774 MN883560
Linocarpon arengae MFLUCC 15-0331 MG272247 –MG366596 –
Linocarpon cocois MFLUCC 15-0812 MG272248 MG272257 MG272253 –
Menispora tortuosa DAOM 231154 AY544682 KT225527 AY544723 –
CBS 214.56 AF178558 AF178558 – –
Menisporopsis anisospora CBS 109475 MH874421 MH862827 – –
Menisporopsis breviseta GZCC 18-0071 MN104623 MN104612 MN104632 –
Menisporopsis dushanensis GZCC 18-0084 MN104626 MN104615 MN104635 –
Menisporopsis pandanicola KUMCC 17-0271 MH376726 MH388353 MH388320 MH388388
Menisporopsis theobromae MFLUCC 15-0055 KX609954 KX609957 – –
Neolinocarpon arengae MFLUCC 15-0323 MG272249 MG272258 MG366597 –
Neolinocarpon rachidis MFLUCC 15-0332 MG272250 –MG366598 –
MFLUCC 15-0814a MK106353 MK106342 MK106367 –
MFLUCC 15-0814b MK106354 –MK106368
Neolinocarpon phayaoense MFLUCC 17-0073a MG581933 –MG581936 MG739512
MFLUCC 17-0073b MG581934 –MG581937 MG739513
MFLUCC 17-0074 MG581935 –MG581938 MG739514
Phialosporostilbe scutiformis MFLUCC 17-0227 MH758207 MH758194 MH758201 –
MFLUCC 18-1288 MH758212 MH758199 – –
Ruzenia spermoides SMH4606 AY436422 – – –
SMH4655 KF765619 – – –
Synaptospora plumbea ANM963 KF765620 – – –
SMH3962 KF765621 – – –
Sordaria micola CBS 508.50 MH868251 MH856730 – –
Zanclospora iberica FMR 11584 KY853544 KY853480 HF937360 –
FMR 12186 KY853545 KY853481 HF937361 –
Notes. New species in this study is in bold. “–” means that the sequence is missing or unavailable.
Abbreviations. ANM: Collection of A.N. Miller; BCC: BIOTEC Culture Collection, National Center for Genetic Engineering and Biotech-
nology (BIOTEC), Bangkok, ailand; CBS: Centraalbureau voor Schimmelcultures, Utrecht, Netherlands; DAOM: Canadian Collection of
Fungal Cultures, Agriculture and Agri-Food Canada, Ottawa, Canada; FMR: Facultad de Medicina, Universitat Rovira i Virgili, Reus, Tarragona,
Spain; GZCC: Guizhou Culture Collection, Guiyang, China; KUMCC: Kunming Institute of Botany Culture Collection, Chinese Academy
of Sciences, Kunming, China; MFLU: Herbarium of Mae Fah Luang University, Chiang Rai, ailand; MFLUCC: Mae Fah Luang University
Culture Collection, Chiang Rai, ailand; SICAUCC: Sichuan Agricultural University Culture Collection, Sichuan, China; SMH: Collection
of S.M. Huhndorf.
Claviformispora gen.nov. from Phyllostachys heteroclada 5
Phylogenetic analyses
Taxa to be used for phylogenetic analyses were selected, based on results generated
from nucleotide BLAST searches online in GenBank and recent publications (Lu et
al. 2016; Konta et al. 2017; Senwanna et al. 2018; Wei et al. 2018; Lin et al. 2019).
Gelasinospora tetrasperma (CBS 178.33) and Sordaria micola (CBS 508.50) were se-
lected as the outgroup taxa. e sequences were downloaded from GenBank (http://
www.ncbi.nlm.nih.gov/) and the accession numbers are listed in Table 1. A combined
ITS, LSU, SSU and TEF-1α sequence dataset was used to construct the phylogenetic
tree. DNA alignments were performed by using MAFFT v.7.429 online service (Katoh
et al. 2019) and ambiguous regions were excluded with BioEdit version 7.0.5.3 (Hall
1999). Multigene sequences were concatenated by using Mesquite software (Maddi-
son and Maddison 2019). Maximum Likelihood (ML) and Bayesian Inference (BI)
analyses were performed. e best nucleotide substitution model was determined by
MrModeltest v. 2.2 (Nylander 2004).
Maximum Likelihood analysis and Bayesian Inference analysis were generated
by using the CIPRES Science Gateway web server (Miller 2010). RAxML-HPC2 on
XSEDE (8.2.10) (Stamatakis 2014) with GTR+GAMMA substitution model with
1000 bootstrap iterations was chosen for Maximum Likelihood analysis. For BI analy-
ses, the best-t model GTR+I+G for ITS, LSU and SSU was selected in MrModeltest
2.2 and GTR+G for TEF. e analyses were computed with six simultaneous Markov
Chain Monte Carlo (MCMC) Chains with 8,000,000 generations and a sampling fre-
quency of 100 generations. e burn-in fraction was set to 0.25 and the run automati-
cally ended when the average standard deviation of split frequencies reached below 0.01.
Phylogenetic trees were visualised with FigTree v.1.4.3 (Rambaut and Drummond
2016) and edited using Adobe Illustrator CS6 (Adobe Systems Inc., United States).
Maximum Likelihood bootstrap values (MLBP) equal to or greater than 70% and
Bayesian Posterior Probabilities (BYPP) equal to or greater than 0.95 were accepted.
e nalised alignment and tree were deposited in TreeBASE (http://www.treebase.
org), submission ID: 25996. e new taxa introduced follow the recommendations of
Jeewon and Hyde (2016).
Results
Phylogenetic analyses
Phylogenetic analyses of a combined dataset (ITS, LSU, SSU, TEF-1α) comprises 51
taxa within the order Chaetosphaeriales (Table 1), including 24 taxa in family Chaeto-
sphaeriaceae, nine taxa in Helminthosphaeriaceae, ten taxa in Linocarpaceae, six taxa in
Leptosporellaceae and two outgroup taxa in Sordariales. e dataset consisted of 5,849
characters including gaps (LSU = 1,571, ITS = 736, SSU = 2,522, TEF=1,020). e
best scoring tree of RAxML analysis is shown in Fig. 1, with the support values of ML
and BI analyses.
Xiu-Lan Xu et al. / MycoKeys 70: 1–17 (2020)
6
Figure 1. Phylogram of RAxML analysis based on a combined ITS, LSU, SSU and TEF-1α sequence
dataset within order Chaetosphaeriales. Bootstrap support values for maximum likelihood (ML, left)
greater than 70% and Bayesian posterior probabilities (PP, right) equal to or greater than 0.95 are indi-
cated at the nodes. e tree is rooted to Gelasinospora tetrasperma (CBS 178.33) and Sordaria micola
(CBS 508.50). All sequences from ex-type strains are in bold. e newly-generated sequence is in red.
Claviformispora gen.nov. from Phyllostachys heteroclada 7
e best scoring RAxML tree with the nal optimisation had a likelihood value of
-26,415.700648. e matrix had 1,751 distinct alignment patterns and 64.64% in this
alignment is the gaps and completely undetermined characters. Estimated base frequen-
cies were as follows: A = 0.236065, C = 0.261532, G = 0.295313, T=0.207091, with
substitution rates AC = 1.062535, AG = 1.855434, AT = 0.940219, CG=1.052604,
CT= 4.590285, GT = 1.000000. e gamma distribution shape parameter α=0.311923
and the Tree-Length = 2.281738. e Bayesian analysis resulted in 20,502 trees after
8,000,000 generations. e rst 25% of trees (1,624 trees), which represent the burn-
in phase of the analyses were discarded, while the remaining 4,878 trees were used for
calculating posterior probabilities. Bayesian posterior probabilities were evaluated by
MCMC with a nal average standard deviation of split frequencies=0.009877.
Phylogenetic trees generated from Maximum Likelihood (ML) and Bayesian In-
ference analyses were similar in overall topologies. Phylogeny from the combined se-
quence data analysis indicates that all families were monophyletic with strong boot-
strap support values (Fig. 1). Phylogenetic results show that our novel species Clavi-
formispora phyllostachydis (SICAUCC 16-0004) belongs to family Linocarpaceae with
91% ML and 1.00 BYPP support and close to genera Neolinocarpon and Linocarpon
(Fig. 1). e new genus Claviformispora constituted a distinct lineage in the family
Linocarpaceae (Fig. 1).
Taxonomy
Linocarpaceae S. Konta & K.D. Hyde, Mycosphere 8(10): 1962 (2017) emend.
Type genus. Linocarpon Syd. & P. Syd.
Description. Saprobic and endophytic fungi on monocotyledons and rarely di-
cotyledons. Sexual morph: Ascomata solitary or aggregated, supercial or immersed
comprising black, dome-shaped or subglobose, slightly raised blistering areas with a
central ostiole or immersed with a black shiny papilla. Peridium composed of dark
brown to black cells of textura angularis. Hamathecium comprising septate paraphyses
that are longer than asci, wider at the base, tapering towards the apex. Asci 8-spored,
unitunicate, cylindrical, with a J-, apical ring, developing from the base and periphery
of the ascomata. Ascospores parallel or spiral in asci, hyaline or pale yellowish in mass,
liform or claviform, straight or curved, unicellular with or without refringent bands,
with or without polar appendages. Asexual morph: Phialophora-like spp. were found
in Linocarpon appendiculatum and L. elaeidis cultures (Hyde 1992b), but no records
are available for other species.
Notes. Linocarpaceae was introduced as a new family to accommodate Linocarpon
and Neolinocarpon species, based on morphology and phylogeny (Konta et al. 2017).
Appressoria were rst recorded from Neolinocarpon rachidis (Hyde et al. 2019). e
new genus Claviformispora, which is well-supported within Linocarpaceae suggests
Xiu-Lan Xu et al. / MycoKeys 70: 1–17 (2020)
8
that there is a need to amend the morphological circumscriptions of the family given
that the ascomata (subglobose) and ascospore (claviform) characters are so dierent
from the other two genera.
Claviformispora X. L. Xu & C. L. Yang, gen. nov.
Index Fungorum identier: IF557395
Type species. Claviformispora phyllostachydis X. L. Xu & C. L. Yang
Etymology. Name reflects the claviform ascospores.
Description. Saprobic on dead branches. Sexual morph: Stromata solitary or gre-
garious, black, erumpent. Ascomata solitary or aggregated, immersed, subglobose, slightly
raised blistering areas with a central ostiole with periphyses. Peridium outer cells merging
with the host tissues, composed of pale to dark brown cells of textura angularis. Hamathe-
cium comprising hyaline, septate paraphyses, longer than asci, wider at the base, tapering
towards the apex. Asci 8-spored, cylindrical to cylindric-clavate, unitunicate, short pedicel-
late, apically rounded, with a doughnut-shaped, refractive, J- apical ring. Ascospores over-
lapping uniseriate or 2-seriate, clavated with a thin pedicellate, 1-celled, hyaline, without
appendage and refringent bands, smooth-walled. Asexual morph: Undetermined.
Notes. Claviformispora resembles Neolinocarpon in having immersed ascomata and
ostiole with periphyses, but diers in forming aggregated ascomata, cylindric-clavate,
short pedicellate asci, clavate ascospores with thin pedicel and without septa-like
bands and appendages, whereas the ascospores of Neolinocarpon and Linocarpon (Li-
nocarpaceae) species are usually liform with refringent bands and appendages (Hyde
1992b, 1997; Konta et al. 2017). e nature of the ascospore appendages appears to be
phylogenetically signicant for intergeneric delineation as has been seen in other stud-
ies (Poonyth et al. 2000; Jeewon et al; 2003, ongkantha et al. 2003; Cai et al. 2004;
Konta et al. 2017), but this warrants further investigations with more sampling and
fresh collections of Neolinocarpon and Linocarpon. Dierences in morphology between
these genera in Linocarpaceae are summarised in Table 2.
Claviformispora phyllostachydis X. L. Xu & C. L. Yang, sp. nov.
Index Fungorum identier: IF557396
Fig. 2
Type. C, Sichuan Province, Ya’an City, Yucheng Distinct, Kongping Township,
alt. 1133 m, 29°50.14'N, 103°03'E, on dead branches of Phyllostachys heteroclada Oliv.
(Poaceae), 11 December 2016, C. L. Yang and X. L. Xu, YCL201612002 (SICAU
16-0007, holotype; MFLU 18-1217, isotype), ex-type living culture, SICAUCC 16-
0004= MFLUCC 18-1230.
Etymology. e specic epithet refers to the host genus Phyllostachys.
Description. Saprobic on dead branches of Phyllostachys heteroclada Oliv. Sexu-
al morph: Stromata solitary comprising elliptical areas or aggregated in large black
Claviformispora gen.nov. from Phyllostachys heteroclada 9
areas, slightly raised with slit-like openings presenting on host surface. Ascomata
120–240µm high × 220–490 µm diameter (x¯ = 189 × 345 µm, n = 20), perithecial,
immersed, central, papillate ostiole with periphyses, oval-globose in section, the cells
between the perithecia are composed with tissue of stromata and host. Peridium
20–40 µm wide (x¯ = 33 µm, n = 10), outer cells merging with the host tissues, com-
posed of pale to dark brown cells of textura angularis. Hamathecium comprising hya-
line, hypha-like, septate paraphyses, occasionally branched, longer than asci, wider
at the base, 2–4 µm diameter (x¯ = 2.7 µm, n = 20) tapering towards the apex, 0.78–
1.20µm diameter (x¯ = 0.98 µm, n = 20). Asci 90–160 × 9–15 µm (x¯ = 118×13µm,
n=20), 8-spored, cylindrical to cylindric-clavate, unitunicate, short pedicellate, api-
cally rounded, with a massive, doughnut-shaped, refractive, J- reaction, apical ring.
Ascospores 35–50 × 5.7–8.6 µm (x¯ = 45.7 × 7.0 µm, n = 40), overlapping uniseriate
or 2-seriate, claviform typically with a thin pedicel, aseptate, hyaline, straight or
slight curved, without appendage and septum-like bands, guttulate when maturity.
Asexual morph: Undetermined.
Culture characters. Ascospores germinated on PDA within 12 hours at both ends.
Colonies on PDA reaching 5 cm diameter after 7 days at 25 °C, white to grey with
strong radiations outwards on forward side. Colonies became dark brown and black on
the reverse after a long time of cultivation. e hyphae are septate, branched, smooth.
Table 2. Morphological comparison of Linocarpon, Neolinocarpon and Claviformispora.
Morphology Linocarpon Neolinocarpon Claviformispora
(Type: L. pandani) (Type: N. globosicarpum) (Type: C. phyllostachydis)
Stromata Absent Absent Solitary or aggregated, comprising
elliptical areas and large black areas, with
slit-like openings
Ascomata Solitary, supercial, subglobose,
comprising black, dome-shaped, raised
blistering areas, central ostiole
Solitary, deeply immersed, oval to
globose, with central raised, dark, shiny
papilla, central ostiole with periphyses
Solitary or aggregated, deeply immersed,
subglobose, slightly raised blistering
areas, central ostiole with periphyses
Peridium Textura angularis Textura angularis Textura angularis
Hamathecium Hyaline, septate paraphyses, longer
than asci
Hyaline, septate paraphyses, longer
than asci
Hyaline, septate paraphyses, longer
than asci
Asci Cylindrical, unitunicate, a small non-
amyloid apical ring
Long cylindrical, pedicellate,
unitunicate, an oblong to wedge-shaped,
refractive, apical ring and some with a
refractive circular body below
Cylindrical to cylindric-clavate,
unitunicate, pedicellate, doughnut-
shaped, refractive, J- apical ring
Ascospores Filiform, aseptate, hyaline or pale-
yellowish in mass, parallel or spiral, with
appendage and refringent septum-like
bands or absent
Filiform, aseptate, hyaline or pale-
yellowish in mass, parallel or spiral, with
apical appendages and refringent bands
or absent
Clavate, thin pedicellate, aseptate,
hyaline, parallel, no appendage and
refringent band
Asexual morph Only found in L. appendiculatum and
L. elaeidis, conidiophore arising from
the aerial mycelium, conidiogenous cells
phialidic, smooth, translucent brown,
conidia clavate to fusiform, straight
or slightly curved or slightly sinuous,
unicellular, smooth, colourless
Undetermined Undetermined
Others Colonies on MEA and PDA growing
slowly
Colonies on MEA growing slowly.
Ascospores on MEA produced
appressoria-like structures at each tip of
germ tube, only found in N. rachidis
Colonies on PDA grow faster
References Hyde (1992b), Konta et al. (2017),
ongkantha et al. (2003)
Hyde et al. (2019), Senwanna et al.
(2018), Hyde et al. (1998)
is study
Xiu-Lan Xu et al. / MycoKeys 70: 1–17 (2020)
10
Figure 2. Claviformispora phyllostachydis (SICAU 16-0007, holotype) a, b Stromata on host substrate
csection through ascoma with ascomata d ostiole with periphyses e peridium f paraphyses g–j asci k–oas-
cospores p germinated ascospore q , r colony on PDA after 7 days. Scale bars: 2 mm (a), 500µm(b),
100µm (c), 20 µm (d, e), 10 µm (f–p).
Claviformispora gen.nov. from Phyllostachys heteroclada 11
Discussion
is study establishes a new genus and also provides further insights into the phylog-
eny of members associated with Linocarpaceae. Morphologically-based examinations of
Claviformispora (as discussed above) clearly show that the morphological circumscrip-
tions (familial concept) of species should be broadened and possibly indicate that this
family is much more diverse than expected. Our collection can be clearly distinguished
from other groups of similar fungi in Linocarpaceae with its interesting ascospore mor-
phology. In addition, we also noted some peculiarities in the DNA sequences we ana-
lysed. A comparison of ITS sequences, based on BLAST reveals 34%, 26% and 30% base
pair dierences with L. cocois (MFLUCC 15-0812), N. arengae (MFLUCC 15-0323)
and N. rachidis (MFLUCC 15-0814a), respectively. ere are more than 9% and 5%
sequence dierences with the three taxa when the LSU and SSU rDNA sequences were
compared respectively. Following the guidelines recommended by Jeewon and Hyde
(2016), there are therefore sucient grounds to establish a new species at the genus rank.
Species of Linocarpaceae have been found on Arecaceae, Poaceae, Euphorbiaceae,
Zingiberaceae, Pandanaceae, Fagaceae, Fabaceae and Smilacaceae, including Arenga,
Attalea, Calamus, Trachycarpus, Acrocomia, Archontophoenix, Cocos, Daemonorops, Lic-
uala, Livistona, Plectocomia, Phoenix, Raphia, Sabal, Mauritia, Nypa, Elaeis, Pinanga,
Eugeissona, Pennisetum, Gramineae, Stipa, unidentied bamboo, Hevea, Manihot, Al-
pinia, Pandanus, Quenrcus, Cajanus and Smilax (Hyde 1988, 1992a, b; Dulymamode
et al. 1998; Hyde et al. 1998; Hyde and Alias 1999; ongkantha et al. 2003; Cai et
al. 2004; Bhilabutra et al. 2006; Vitoria et al. 2013; Konta et al. 2017; Senwanna et
al. 2018). More than 50% of the species were recorded from hosts of the Arecaceae.
Species in Linocarpaceae are mostly saprobic, except Linocarpon palmetto which was
discovered as a pathogen of Sabal palmetto in Florida (Barr 1978). Four species in Li-
nocarpaceae from Poaceae have been reported so far, including Neolinocarpon penniseti
on Pennisetum purpureum (Bhilabutra et al. 2006), Linocarpon williamsii on Gramineae
sp. (Hansford 1954), L. stipae on Stipa sp. (Hansford 1954) and L. bambusicola on
unidentied bamboo submerged in a river (Cai et al. 2004).
Phyllostachys heteroclada, mainly a food source and use as a material in the weaving
industry, is distributed along the Yellow River Valley and the southern Provinces in Chi-
na. It is common in the mountainous areas of Sichuan Province with distribution up to
1,500 m above sea level (Yi 1997; Yi et al. 2008). ere is a large area of pure forest in
Yibin, Leshan and Ya’an Cities and sporadic distribution in other areas. According to
preliminary statistics, bambusicolous fungi from seven orders (excluding fungi referred
to as Sordariomycetes incertae sedis) have been recorded on P. heteroclada, including
Hypocreales, Ostropales, Pleosporales, Phyllachorales, Pucciniales, Ustilaginales and
Xylariales, of which Pleosporales is the largest one. Most bambusicolous fungi in China
were recorded with inadequate morphological descriptions or molecular data. e early
known fungi on P. heteroclada are documented as Aciculosporium take, Ellisembia pseu-
doseptata, Fusarium oxysporum, F. semitectum, Phyllachora gracilis, Ph. orbicular, Shiraia
bambusicola, Stereostratum corticioides and Ustilago shiraiana (Zhou et al. 2001; Xu et
al. 2006). In recent years, some new records and taxa, viz. Bambusicola subthailandica,
Xiu-Lan Xu et al. / MycoKeys 70: 1–17 (2020)
12
B.sichuanensis, Neostagonosporella sichuanensis, Parakarstenia phyllostachydis, Phyllachora
heterocladae, Podonectria sichuanensis, Arthrinium yunnanum and A. phyllostachium have
been reported (Yang et al. 2019a, b, c, d, e, f ). Here, we introduce a new genus in order
Chaetosphaeriales, which is a contribution to fungal diversity on P. heteroclada.
Acknowledgements
We all thank Dr. Shaun Pennycook for his help with the nomenclature of the novel
species. Xiu-Lan Xu thanks the Chengdu Science and Technology Bureau for funding
her research. Ying-Gao Liu and Chun-Lin Yang acknowledge the “Study on identi-
cation of pathogenic fungi and prevention techniques for witches’ broom of Phyl-
lostachys violascens” (fund from the Bureau of Economic Information and Science &
Technology of Yucheng District in Ya’an City) for supporting this work. Dhanushka
Wanasinghe would like to thank CAS President’s International Fellowship Initiative
(PIFI) for funding his postdoctoral research (number 2019PC0008) and the Nation-
al Science Foundation of China and the Chinese Academy of Sciences (grant no.:
41761144055). R Jeewon thanks University of Mauritius for support.
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Supplementary material 1
Figure S1
Authors: Xiu-Lan Xu, Chun-Lin Yang, Rajesh Jeewon, Dhanushka N. Wanasinghe,
Ying-Gao Liu, Qian-Gang Xiao
Data type: multimedia
Copyright notice: is dataset is made available under the Open Database License
(http://opendatacommons.org/licenses/odbl/1.0/). e Open Database License
(ODbL) is a license agreement intended to allow users to freely share, modify, and
use this Dataset while maintaining this same freedom for others, provided that the
original source and author(s) are credited.
Link: https://doi.org/10.3897/mycokeys.70.54231.suppl1
Supplementary material 2
Figure S2
Authors: Xiu-Lan Xu, Chun-Lin Yang, Rajesh Jeewon, Dhanushka N. Wanasinghe,
Ying-Gao Liu, Qian-Gang Xiao
Data type: multimedia
Copyright notice: is dataset is made available under the Open Database License
(http://opendatacommons.org/licenses/odbl/1.0/). e Open Database License
(ODbL) is a license agreement intended to allow users to freely share, modify, and
use this Dataset while maintaining this same freedom for others, provided that the
original source and author(s) are credited.
Link: https://doi.org/10.3897/mycokeys.70.54231.suppl2
