No full-text available
To read the full-text of this research,
you can request a copy directly from the authors.
A new Dictyosporium species from Musa acuminata in Thailand
Abstract
A new species of Dictyosporium found on Musa acuminata in Thailand is described and illustrated. This very distinctive species, which bears lateral appendages, is compared with other species in the genus.
... Conidia. Liu et al. 2015;Kirschner et al. 2013;Kodsueb et al. 2006;McKenzie 2008McKenzie , 2010and Photita et al. 2002, Whitton et al. 2012, Wongsawas et al. 2009, Zhang 2009, and Zhao & Zhang 2003. (Goh et al. 1999); C. D. amoenum (this paper); D. D. aquaticum (Liu et al. 2015); E. D. australiense (Goh et al. 1999); F. D. biseriale (Hu et al. 2010); G. D. brahmaswaroopii (Goh et al. 1999); H. D. bulbosum (Castañeda-Ruiz et al. 1997); I. D. campaniforme (Goh et al. 1999); J. D. canisporum (Cai et al. 2003a); K. D. cocophilum (Goh et al. 1999); L. D. digitatum (Goh et al. 1999); M. D. dkagarwalii (Manoharachary et al. 2007); N. D. elegans (Goh et al. 1999); O. D. foliicola (Goh et al. 1999); P. D. freycinetiae (McKenzie 2008); Q. D. gauntii (Goh et al. 1999); R. D. giganticum (Goh et al. 1999); S. D. heptasporum (Goh et al. 1999). ...
... (Goh et al. 1999); C. D. amoenum (this paper); D. D. aquaticum (Liu et al. 2015); E. D. australiense (Goh et al. 1999); F. D. biseriale (Hu et al. 2010); G. D. brahmaswaroopii (Goh et al. 1999); H. D. bulbosum (Castañeda-Ruiz et al. 1997); I. D. campaniforme (Goh et al. 1999); J. D. canisporum (Cai et al. 2003a); K. D. cocophilum (Goh et al. 1999); L. D. digitatum (Goh et al. 1999); M. D. dkagarwalii (Manoharachary et al. 2007); N. D. elegans (Goh et al. 1999); O. D. foliicola (Goh et al. 1999); P. D. freycinetiae (McKenzie 2008); Q. D. gauntii (Goh et al. 1999); R. D. giganticum (Goh et al. 1999); S. D. heptasporum (Goh et al. 1999). (Kodsueb et al. 2006); E. D. meiosporum (Liu et al. 2015); F. D. micronesiacum (Goh et al. 1999); G. D. musae (Photita et al. 2002); H. D. nigroapice (Goh et al. 1999); I. D. oblongum (Goh et al. 1999 (Goh et al. 1999); R D. taishanense (Zhao & Zhang 2003). (Goh et al. 1999); K. D. zhejiangense (Wongsawas et al. 2009 ...
Dictyosporium amoenum, a new asexual fungus collected on leaves of Calophyllum brasiliense in the Brazilian semiarid Caatinga region, is described and illustrated. It is distinguished by digitate complanate brown conidia composed of four parallel compact rows of cells, each row with a globose hyaline mucous apical appendage. Conidial illustrations and a table comparing all Dictyosporium species are provided.
... Most of the earlier studies were in temperate regions, however knowledge and interest in microfungi in tropical regions have grown. There have been several reports of microfungi on plants in the tropics (Photita et al., 2002; 2003a, b; Hyde et al., 2002a, b; Bussaban et al., 2003; Thongkantha et al., 2003; Promputtha et al., 2003; 2004a, b, c;). Numerous novel fungi have been discovered in these studies (e.g. ...
... There have been several reports of microfungi on plants in the tropics (Photita et al., 2002; 2003a, b; Hyde et al., 2002a, b; Bussaban et al., 2003; Thongkantha et al., 2003; Promputtha et al., 2003; 2004a, b, c;). Numerous novel fungi have been discovered in these studies (e.g. Photita et al., 2002; Bussaban et al., 2003; Promputtha et al., 2003; 2004a, b; Kodsueb et al., 2006; 2007a, b; Pinnoi et al., 2003a, b; Pinruan et al., 2004a Pinruan et al., , b, c, 2008). Previous investigations on parasitic and saprobic fungi have discussed host-specificity or host-recurrence (Hooper et al., 2000; Zhou and Hyde, 2001; Santana et al., 2005). ...
The diversity of fungi found on woody litter of three genera of plants in the family Magnoliaceae is reported and the communities are compared. Saprobic fungi were investigated from 150 samples of decaying woody litter of Magnolia liliifera, Manglietia garrettii and Michelia baillonii. Two-hundred and thirty-nine fungi were identified comprising 92 ascomycetes, 4 basidiomycetes and 143 anamorphic fungi. Corynespora cassiicola (60% frequency of occurrence) was the most common taxon found on Magnolia liliifera samples. Ellisembia opaca and Phaeoisaria clematidis with 27.5% frequency of occurrence were the dominant species from Manglietia garrettii, while Annellophora phoenicis and Ellisembia adscendens (18%) were the most commonly encountered species from Michelia baillonii. Distinct fungal communities were found on samples of the three tree species. In terms of the numbers of taxa recovered, fungi were more diverse on Michelia baillonii than on the other two genera, although the common genera of fungi obtained from woody litter of each host were similar. Seasonal effect on the fungal communities was investigated. Dry season samples supported a significantly more diverse fungal community than samples from the wet season. Relatively few species of woody fungi recorded in this study had been previously recorded from wood samples by other researchers.
... Dictyocheirospora tetraploides is morphologically similar to Di. musae in conidial shape, size, colour and appendages. However, conidia of Di. tetraploides have 5-rowed cells, while those of Di. musae are 7-rowed cells (Photita et al. 2002, Cai et al. 2003. Etymology. ...
A survey of freshwater fungi on submerged wood in China and Thailand resulted in the collection of three species in Dictyocheirospora and four species in Dictyosporium including two new species in the latter genus. Morphological characters and phylogenetic analyses based on ITS, LSU and TEF1α sequence data support their placement in Dictyocheirospora and Dictyosporium (Dothideomycetes). An updated backbone tree is provided for the family Dothideomycetes. Descriptions and illustrations of the new taxa and re-collections are provided. Four new combinations are proposed for Dictyocheirospora .
... Subsequently 30 other species were described by Arambarri et al. (2001), Cai et al. *Corresponding author: elaine.malosso@ufpe.br eschweizerbart_xxx (2003a, b), Photita et al. (2002), Zhao & Zhang (2003), Kodsueb et al. (2006), Cai & Hyde (2007), Manoharachary et al. (2007), McKenzie (2008, 2010), Crous et al. (2009, 2011), Wongsawas et al. (2009), Zhang (2009), Hu et al. (2010, Whitton et al. (2012), Kirschner et al. (2013), Liu et al. (2015), Prasher & Verma (2015), Silva et al. (2015), Silva et al. (2016). ...
Dictyosporium splendidum sp. nov. and Helminthosporium varium sp. nov., both found on decaying leaves of unidentified plants are described and illustrated. D. splendidum is characterized by conidia composed of two or three parallel rows of cell, tightly arranged in 3-planes or complanate, with a cylindrical or irregular, hyaline mucous appendage at each apical cell. H. varium is distinguished by its blastocatenate, long obclavate, subcylindrical, oblong or navicular, 1–4-septate, spacing verrucose or verruculose, gray-brown or brown conidia.
... Colonies on natural substrates often form compact sporodochia (Goh et al., 1999). Currently over 20 species are accepted, and they are distinguished by morphological characters such as the number of conidial arms, the shape, colour and size of the conidia, and the presence/ absence of appendages (Goh et al., 1999;Photita et al., 2002;Cai et al., 2003a,b). The genus has been considered homogeneous (Sutton, 1985), but depending on the species, conidia are either flattened or cylindrical (Fig. 1A, B) (Ellis, 1971;Goh et al., 1999;Abrambarri et al., 2001). ...
The relationships among mitosporic fungi with cheiroid conidia in the genera Cheiromoniliophora, Dictyosporium, Kamatia and Pseudodictyosporium were investigated using sequences of small ribosomal subunit (SSU), internal transcribed spacer regions (ITS) and the 5' portion of the large ribosomal subunit (LSU) of RNA. Six new SSU sequences were determined and analysed together with related sequences from GenBank using parsimony and Bayesian analyses. A second alignment with 15 ITS and seven partial LSU sequence of rDNA for an expanded set of taxa was also analysed to determine the relationships among various species and genera. Results indicated that the "Dictyosporium" lineage of mitosporic fungi producing cheiroid conidia are closely related to one another and they form a strong monophyletic group in the Pleosporales. Dictyosporium appeared to be paraphyletic but its monophyly could not be ruled out. Most Dictyosporium species belonged in one of two lineages that correlated imperfectly with conidial shape and the number of conidial arms. The systematic positions of Dictyosporium australiense and D. toruloides were not fully resolved. The phylogenetic position of Digitodesinium was within Dictyosporium, although without statistical support. Cheiromondiophora elegans, Kamatia indica and Pseudodictyosporium wauense were close relatives and formed a monophyletic clade divergent from species of Dictyosporium. Most morphological characters used to delineate genera and species correctly predicted phylogenetic relationships.
... com.). In D. musae the conidial appendages arise from the central cells of the outer rows (Photita et al., 2002). D. gauntii has what is regarded as a hyaline, bulbose conidiogenous cell attached to the basal cell of the conidia after conidial secession (Bhat & Sutton, 1985;Goh et al., 1999). ...
Acrodictys micheliae sp. nov. and Dictyosporium manglietiae sp. nov. are described from dead woody litter of Michelia baillonii and Manglietia garrettii, respectively, collected in Doi Suthep-Pui National Park, Thailand. The new fungi are distinctive and readily separated from those already described in the two genera. Acrodictys micheliae has cylindric-ovoid conidia that are similar in shape to A. septosporioides but smaller in size. Dictyosporium manglietiae is distinct from other species in that the conidia have a hyaline, fusoid to cylindrical appendae produced from the basal cell of the outer row of cells. The new taxa are described and illustrated, and compared with similar species.
... It is believed that the high amount of litter generated in tropical rain forests may support a rich fungal diversity (Hyde, 1997). Recent studies of fungal diversity in Thailand have resulted in a number of new fungal taxa being described from several habitats (banana: Photita et al., 2002; dead leaves of a climber: Somrithipol and Jones, 2005; Magnoliaceae: Kodsueb et al., 2006; Promputtha et al., 2003; 07_Kodsueb.fm Page 1 Jeudi, 14. juin 2007 12:11 12 Colonies effuse, golden-brown. ...
Catenosynnema micheliae gen. et sp. nov. and Oedemium micheliae sp. nov. are described from dead woody litter of Michelia baillonii (Magnoliaceae) collected from Doi Suthep-Pui National Park, Thailand. The novel anamorphic genus, Catenosynnema is characterised by synnematous conidiophores and subhyaline to pale brown, catenate conidia. The genus is similar to the anamorphic genera Seifertia and Sorocybe, both of which have catenate conidia, but differs in that its synnemata are paler in colour and of a different form. The second anamorphic taxon, Oedemium micheliae sp. nov. is distinct from other species in the genus in having conidia in short chains and possessing secondary conidiogenous ampullae. The new taxa are described, illustrated and compared with morphologically similar anamorphic fungi.
... , only D. musaePhotita (Photita et al. 2002), D. tetraploides L.K.D. Hyde (Cai et al. 2003b) and D. freycinetiae McKenzie (McKenzie 2008) have conidia that are not complanate. The other ten species: D. alatum Emden(Emden 1975), D.gauntii Bhat & B. Sutton (Bhatt & Sutton 1985), D. bulbosum Tzen & Chen (Tzen & Chen 1989), D. digitatum Chen, Hwang & Tzean (Chen et al.1990), D. nigroapice Goh, W.H. Ho & K.D. Hyde (Goh et al. 1999), D. tetraseriale Goh, Yanna & K.D. Hyde (Goh et al. 1999), D. canisporum L. Cai & K.D. Hyde (Cai et al. 2003b), D. manglietiae Kodsueb & McKenzie (Kodsueb et al. 2006), D. streliziae Crous & A.R. Wood (Crous et al. 2009), D. zhejiangensis Wongsawas, K.D. Hyde & F.C. Lin (Mongkol et al. 2009) and D. hughesii McKenzie (McKenzie 2010), have complanate conidia. ...
Two species of Dictyosporium were collected from forests of Himachal Pradesh, India. Dictyosporium indicum sp. nov. andD. hydei sp. nov., found on a dead petiole of Phoenix rupicola and bark of Tecoma stans, respectively, are described and illustrated.The former species is characterized by conidia with sub-apical appendages while the latter has supra-basal conidial appendages. A synopsis of the genus is also provided
... Por las esporas, Photita et al. (2002) la asocia con D. musae y D. giganticum (además de D. heptasporum) Todas con siete líneas celulares y diferencias en tamaño. ...
Dictyosporium subramanianii B. Sutton
... Goh et al. (1999) revised Dictyosporium and 22 species were accepted. Eight species were subsequently added into this genus (Arambarri et al. 2001;Cai et al. 2003a,b;Photita et al. 2002;Zhao and Zhang 2003;Kodsueb et al. 2006). ...
This article describes two new anamorphic fungi from freshwater habitats, Dictyosporium tetrasporum sp. nov. and Exserticlava yunnanensis sp. nov., based on morphological characters. Both species are illustrated with light micrographs and compared with similar
taxa. Pseudofuscophialis lignicola and Pseudobotrytis terrestris are reported as new records from freshwater habitats.
Five fungal taxa collected from plant litter in Chiang Mai province, Thailand, are described with illustrations. The maximum likelihood, maximum parsimony, and Bayesian analyses of combined loci of the internal transcribed spacer (ITS), large subunit nuclear ribosomal DNA (LSU), and translation extension factor 1-α (tef1-α) region were used for phylogeny analyses. Dictyocheirospora acaciae is introduced as a new species from Acacia dealbata. Based on size differences in conidiomata, conidia, and DNA sequence data, it is separated from the other species in the genus. Four new host records, Dictyocheirospora garethjonesii, Di. taiwanense, Dictyosporium digitatum, and Pseudocoleophoma zingiberacearum are also reported from Bismarkia nobilis, Ficus benjamina, Cyperus aggregatus, and Hedychium spicatum, respectively. Detailed descriptions, microphotographs, and phylogenetic information were provided, and all the species were compared to similar taxa. It is noted that there is still a necessity for a collective worldwide account of the distribution of Dictyosporiaceae species. Therefore, we compiled the geographical distributions and host species associations of all the so far known Dictyosporiaceae species and discussed them here.
China and Thailand are rich in fungal diversity with abundant freshwater resources that are favorable for numerous fungal encounters. Resulting from this, the majority of the Dictyosporiaceae species reported were from these two countries. During the investigation on the diversity of lignicolous freshwater fungi in the Greater Mekong Subregion, eleven collections of cheirosporous species on submerged wood were collected from lentic and lotic habitats in China and Thailand. Phylogenetic analysis that combined nuclear small-subunit ribosomal RNA (SSU), internal transcribed spacer region (ITS), nuclear large subunit ribosomal RNA (LSU) and translation elongation factor 1α (tef 1-α) loci revealed six new species: Dictyocheirospora chiangmaiensis, D. multiappendiculata, D. suae, Digitodesmium aquaticum, Vikalpa grandispora and V. sphaerica. In addition, four known species were also identified and reported based on morphological and phylogenetic evidence. The detailed descriptions and illustrations of these taxa are provided with an updated phylogenetic tree of Dictyosporiaceae.
Dubey R. 2022. Dictyosporium matherense sp. nov.: A new-fangled cheirosporous fungal species described from the Western Ghats of India. Asian J For 6: 1-8. A new species of Dictyosporium from forest areas of Matheran, Western Ghats of India is described and illustrated. This new-fangled cheirosporous species is characterized by large conidia being cheiroid, digitate, variable shape, having 600-3000 individual cells arranged in 15-80 rows consisting of widening apical end with tightly appressed prolongations/arms which produces hyaline, rounded appendages which latter on produces 8-20 hyaline, long, and hypha-like septate appendages. The isolate was identified based on asexual morphs and to some extent stands close to D. palmae, D. digitatum, and D. stellatum, but remarkably differs from all of them in size of conidia. To our understanding, the present taxon has turned out to be hitherto unreported species. The morphological character of all accepted species of Dictyosporium is also presented.
Abdel-Aziz FA 2016 – Two new cheirosporous asexual taxa (Dictyosporiaceae, Pleosporales, Dothideomycetes) from freshwater habitats in Egypt. Mycosphere 7(4), 448–457, Doi 10.5943/mycosphere/7/4/5 Abstract Cheirosporium vesiculare and Dictyosporium palmae spp. nov. were collected from submerged wood in the River Nile, Sohag, Egypt. Cheirosporium vesiculare is characterized by macronematous conidiophores, and non-complanate conidia, that are circular in vertical view with seven rows arranged in six peripheral rows and one in the center. Conidia are equipped with 2 to 5 balloon-like large appendages with long necks that penetrate through the peripheral rows and connect to the central row. Phylogenetic analyses of LSU sequence data place C. vesiculare in a monophyletic clade with C. triseriale in the family Dictyosporiaceae. Dictyosporium palmae is distinguished from the previously described species by its different conidial dimensions and the variable shapes of the gelatinous conidial appendages. Phylogenetic analyses of LSU sequence data place D. palmae in Dictyosporium sensu sticto in a clade with D. digitatum and D. stellatum with high statistical support.
Berkleasmium pandani, found on dead leaves of Pandanus sp. in Malaysia, and Dictyosporium freycinetiae, found on dead leaves of Freycinetia banksii in New Zealand, are illustrated and described as new species and compared with related taxa.
We here taxonomically revise the suborder Massarineae (Pleosporales, Dothideomycetes, Ascomycota). Sequences of SSU and LSU nrDNA and the translation elongation factor 1-alpha gene (tef1) are newly obtained from 106 Massarineae taxa that are phylogenetically analysed along with published sequences of 131 taxa in this suborder retrieved from GenBank. We recognise 12 families and five unknown lineages in the Massarineae. Among the nine families previously known, the monophyletic status of the Dictyosporiaceae, Didymosphaeriaceae, Latoruaceae, Macrodiplodiopsidaceae, Massarinaceae, Morosphaeriaceae, and Trematosphaeriaceae was strongly supported with bootstrap support values above 96 %, while the clades of the Bambusicolaceae and the Lentitheciaceae are moderately supported. Two new families, Parabambusicolaceae and Sulcatisporaceae, are proposed. The Parabambusicolaceae is erected to accommodate Aquastroma and Parabambusicola genera nova, as well as two unnamed Monodictys species. The Parabambusicolaceae is characterised by depressed globose to hemispherical ascomata with or without surrounding stromatic tissue, and multi-septate, clavate to fusiform, hyaline ascospores. The Sulcatisporaceae is established for Magnicamarosporium and Sulcatispora genera nova and Neobambusicola. The Sulcatisporaceae is characterised by subglobose ascomata with a short ostiolar neck, trabeculate pseudoparaphyses, clavate asci, broadly fusiform ascospores, and ellipsoid to subglobose conidia with or without striate ornamentation. The genus Periconia and its relatives are segregated from the Massarinaceae and placed in a resurrected family, the Periconiaceae. We have summarised the morphological and ecological features, and clarified the accepted members of each family. Ten new genera, 22 new species, and seven new combinations are described and illustrated. The complete ITS sequences of nrDNA are also provided for all new taxa for use as barcode markers.
Eighty-one genera and 152 species of anamorphic fungi were found on dead leaves of Pandanaceae, collected in 14 countries (Australia, Brunei Darussalam, Fiji, Hawaii, Hong Kong, Malaysia, Mauritius, Nepal, New Zealand, Niue, Philippines, Seychelles, Vanuatu, Vietnam). This includes three new genera of anamorphic fungi (Dichotophora, Ramicapitulum, Sporotretophora) and 20 new species (Arthrowallemia lammaensis, Berkleasmium atroapicale, Cryptophiale fruticetum, Cryptophiale hamulata, Dichotophora asetosa, Dichotophora setiramosa, Dictyosporium acroinflatum, Dictyosporium pandani, Endophragmiella pandani, Endophragmiella queenslandica, Gliomastix pandani, Hemicorynespora mauritiana, Ityorhoptrum sphaericosporum, Mycoleptodiscus freycinetiae, Ramicapitulum chinense, Ramoconidiifera seychellensis, Spadicoides australiensis, Spegazzinia cruciata, Sporotretophora punctata, Thozetella serrata). The new combination Berkleasmium monilicellulare and new name Ramoconidiifera neonominata are also proposed. Each genus is headed with a full bibliographic reference, type species and its associated bibliographic reference, a brief characterisation and discussion regarding taxonomic issues of importance within the genus, and reference to preceding work within the genus. Specimens identified as currently known species are written up with bibliographic details, some relevant measurements of the current specimens, known habitat and distribution, collection details, and a discussion regarding the taxonomic conclusions drawn. Any additional information deemed to be of taxonomic importance is noted, especially if the current specimens differ morphologically or dimensionally from the original described specimen. Taxa confirmed as new to science are written up with a full description, etymology of the specific epithet, known habitat and distribution, collection details, and a discussion of relevant details defending the introduction of a new taxon. New taxa are illustrated with a photographic plate showing macro- and microscopic details relevant to the specimen in question. Keys and/or synoptic tables are provided to all species in 28 genera.
Dictyosporium canisporum sp. nov., D. tetraploides sp. nov. and Digitodesmium heptasporum sp. nov. collected from wood submerged in several forest streams of Yunnan, China, are described in this paper. Each new taxon is illustrated and compared with similar taxa.
Dictyosporium hughesii sp. nov. and D. rhopalostylidis sp. nov., found on dead leaves of the palm, Rhopalostylis sapida in New Zealand are illustrated and described and compared with related taxa.
Background:
Banana (Musa spp.) is grown throughout the tropical and subtropical regions of the world. The fruits are a key staple food in many developing countries and a source of income for subsistence farmers. Bananas are also a major, multibillion-dollar export commodity for consumption primarily in developed countries, where few banana cultivars are grown. The fungal pathogen Mycosphaerella fijiensis causes black leaf streak disease (BLSD; aka black Sigatoka leaf spot) on the majority of edible banana cultivars grown worldwide. The fact that most of these cultivars are sterile and unsuitable for the breeding of resistant lines necessitates the extensive use of fungicides as the primary means of disease control. BLSD is a significant threat to the food security of resource-poor populations who cannot afford fungicides, and increases the environmental and health hazards where large-acreage monocultures of banana (Cavendish subgroup, AAA genome) are grown for export.
Taxonomy:
Mycosphaerella fijiensis M. Morelet is a sexual, heterothallic fungus having Pseudocercospora fijiensis (M. Morelet) Deighton as the anamorph stage. It is a haploid, hemibiotrophic ascomycete within the class Dothideomycetes, order Capnodiales and family Mycosphaerellaceae. Its taxonomic placement is based on DNA phylogeny, morphological analyses and cultural characteristics.
Disease symptoms and host range:
Mycosphaerella fijiensis is a leaf pathogen that causes reddish-brown streaks running parallel to the leaf veins, which aggregate to form larger, dark-brown to black compound streaks. These streaks eventually form fusiform or elliptical lesions that coalesce, form a water-soaked border with a yellow halo and, eventually, merge to cause extensive leaf necrosis. The disease does not kill the plants immediately, but weakens them by decreasing the photosynthetic capacity of leaves, causing a reduction in the quantity and quality of fruit, and inducing the premature ripening of fruit harvested from infected plants. Although Musa spp. are the primary hosts of M. fijiensis, the ornamental plant Heliconia psittacorum has been reported as an alternative host.
New opportunities:
Several valuable tools and resources have been developed to overcome some of the challenges of studying this host-pathogen system. These include a DNA-mediated fungal transformation system and the ability to conduct targeted gene disruptions, reliable quantitative plant bioassays, diagnostic probes to detect and differentiate M. fijiensis from related pathogens and to distinguish strains of different mating types, and a genome sequence that has revealed a wealth of gene sequences and molecular markers to be utilized in functional and population biology studies.
Useful websites:
http://bananas.bioversityinternational.org/, http://genome.jgi-psf.org/Mycfi2/Mycfi2.home.html, http://www.isppweb.org/names_banana_pathogen.asp#fun, http://www.promusa.org/.
Results of an investigation into the fungi associated with dead tissue of Musa acuminata at two sites in Hong Kong are reported. Forty-six fungi were identified, comprising 14 ascomycetes and 32 mitosporic taxa (27 hyphomycetes and 5 coelomycetes). The frequency of occurrence of these fungi at the two sites was also investigated. The most common species was Memnoniella subsimplex which occurred on 70% of samples, followed by Verticillium sp. (48.75%) and Zygosporium oscheoides (47.5%). The mycota of the two sites differed significantly in species composition, although Memnoniella subsimplex, Nigrospora oryzae, Pyriculariopsis parasitica, Verticillium sp. and Zygosporium oscheoides were common at both sites. Durispora musae, Memnoniella subsimplex, Nigrospora oryzae, Pyriculariopsis parasitica and Verticillium sp. were restricted to the petioles, while Anthostomella clypeoides, Deightoniella torulosa and Hansfordia ovalispora were restricted to the leaves.
Dictyosporium bulbosum sp. nov. and D. verrucosum sp. nov. are described, illustrated and compared with other Dictyosporium species of similar conidial morpholgy.
Dictyosporium digitatum sp. nov. is described from a fallen, decaying herbaceous stem. It is sporodochial and characterized by cheiroid conidia consisting of 4–8 parallel, tightly appressed arms which are flattened in one plane. Arms ascend from a more or less triangular basal cell. The apex of each arm is digitate, distinctly thin-walled, hyaline, straight or flexuous, incurved or even curled. The morphological distinction between D. digitatum and other closely related species in Dictyosporium, Cheiromyces and Cheiromycella is discussed.
Several new and interesting hyphomycetes including Weufia tewoldei gen.et sp.nov., Beltraniella aethiopica sp.nov., Dictyosporiumgauntii sp.nov., Exserticlava uniseptata sp.nov., Gangliostilbe verrucosa sp.nov. and Helminthosporium senseletii sp.nov. are described and illustrated from Ethiopia. Additional notes are provided for Camposporium antennatum, Dendryphion comosum, Dendryphion digitatum, Piricauda cochinensis and Subramaniomyces fusisaprophyticus.
The generic namesChelisporium andCheiroconium are reduced to synonymy withSirothecium and three species are accepted.Cheiromycella is briefly reviewed andCheiromyces is maintained with a single species. Its typification is discussed.Dictyosporium is briefly discussed and a new species,D. australiense, is introduced. The nameD. subramanianii sp. nov. is proposed for the invalidly publishedD. intermedium andD. circinatum is transferred toHelicorhoidion. Digitodesmium is doubtfully kept distinct fromCheiromyces.