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The genus Acanthostigma (Tubeufiaceae, Pleosporales)

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Abstract

The genus Acanthostigma is redescribed on the basis of the re-examination of type material of A. perpusillum, type species of the genus. It is placed in the Tubeufiaceae and is characterized by having dark, setose ascomata, cellular pseudoparaphyses, bitunicate asci, hyaline, multiseptate, cylindrical-fusiform to elongate fusiform ascospores. Helicosporium and Helicomyces anamorphs and occurrence on rotten wood or on stromata of other ascomycetes. Six species are accepted in Acanthostigma. Acanthostigma ellisii, A. longisporum, A. perpusillum, A. revocatum. A. minutum and A. scopulum are redescribed and illustrated on the basis of re-examination of type material. A new combination for A. longisporum is proposed. A kev to species in Acanthostigma is provided. Acanthostigma filisporum is excluded and its affinity to the Niessliaceae is discussed. Acanthostigmina is relegated to synonymy with Acanthostigma. Two species previously referred to Acanthostigmina and one to Tubeufia sect. Acanthostigmina are not accepted in Acanthostigma and are transferred to Taphrophila in the Tubeufiaceae and proposed as three new combinations T. hebridensis, T. miscanthi and T. trichella.
... & Sacc. Acanthostigma currently includes six species and recently has been reviewed by Réblová and Barr (2000). The genus is characterized by vinaceous, reddishbrown or dark brown ascomata that are covered with dark brownish-black, often opaque, obtuse or acute setae. ...
... In species of Tubeufia the ascomata are hyaline, whitish or yellowish to pinkish, but may become dark at maturity. They are smooth, or are covered with protruding cells, thick-walled hyphal appendages, or short dark setae (Réblová and Barr 2000 . 3-4. ...
... Gard. 16:279, 1929, from Réblová andBarr (2000). ...
Article
Acanthostigma scopulum, Tubeufia claspisphaeria sp. nov. and T. paludosa were identified from submerged wood collected in a small forest stream on Lantau Island, Hong Kong. The collections of Acanthostigma scopulum and Tubeufia paludosa differed slightly from the original descriptions. Tubeufia claspisphaeria differs from previously described species in that it has hook-shaped setae that form radially around the ostiole. This new species is described and illustrated and compared with the most similar species. A dichotomous key to the 16 accepted species in Tubeufia is provided.
... Thaxteriella produces brown to black ascomata and the type species is linked to a Helicoma anamorph (Pirozynski 1972), while Tubeufia species are more reddish and brightly colored and the type produces a Helicosporium anamorph (Barr 1980, Goos 1989. Acanthostigma species can have either Helicomyces or Helicosporium anamorphs but unlike the other genera their ascomata have setae (Réblová andBarr 2000, Kodsueb et al 2004). These generic concepts remain confusing and poorly investigated (Pirozynski 1972, Samuels et al 1979, Crane et al 1998, Réblová and Barr 2000, and Thaxteriella is variously retained as a distinct genus or made a section within Tubeufia. ...
... Acanthostigma species can have either Helicomyces or Helicosporium anamorphs but unlike the other genera their ascomata have setae (Réblová andBarr 2000, Kodsueb et al 2004). These generic concepts remain confusing and poorly investigated (Pirozynski 1972, Samuels et al 1979, Crane et al 1998, Réblová and Barr 2000, and Thaxteriella is variously retained as a distinct genus or made a section within Tubeufia. Tubeufia helicoma and Tubeufia amazonensis have been transferred to Thaxteriella (Crane et al 1998). ...
... Tubeufia helicoma and Tubeufia amazonensis have been transferred to Thaxteriella (Crane et al 1998). Tubeufia clintonii recently was synonymized with Acanthostigma perpusillum (Réblová and Barr 2000). ...
Article
Three genera of asexual, helical-spored fungi, Helicoma, Helicomyces and Helicosporium traditionally have been differentiated by the morphology of their conidia and conidiophores. In this paper we assessed their phylogenetic relationships from ribosomal sequences from ITS, 5.8S and partial LSU regions using maximum parsimony, maximum likelihood and Bayesian analysis. Forty-five isolates from the three genera were closely related and were within the teleomorphic genus Tubeufia sensu Barr (Tubeufiaceae, Ascomycota). Most of the species could be placed in one of the seven clades that each received 78% or greater bootstrap support. However none of the anamorphic genera were monophyletic and all but one of the clades contained species from more than one genus. The 15 isolates of Helicoma were scattered through the phylogeny and appeared in five of the clades. None of the four sections within the genus were monophyletic, although species from Helicoma sect. helicoma were concentrated in Clade A. The Helicosporium species also appeared in five clades. The four Helicomyces species were distributed among three clades. Most of the clades supported by sequence data lacked unifying morphological characters. Traditional characters such as the thickness of the conidial filament and whether conidiophores were conspicuous or reduced proved to be poor predictors of phylogenetic relationships. However some combinations of characters including conidium colour and the presence of lateral, tooth-like conidiogenous cells did appear to be predictive of genetic relationships.
... sensu Barr (1980) is characterized by brightly colored to dark brown ascomata with or without setae, by bitunicate asci and by fusiform, hyaline ascospores (Barr 1980). Two other genera in the Tubeufiaceae, Acanthostigma de Not. and Taphrophila Scheuer, resembled the meiotic ascomycete in having ascomata with setae (Scheuer 1991, Réblová andBarr 2000). Previous analysis of ribosomal SSU, ITS and partial LSU data has shown that Tubeufia sensu Barr (1980) and most species of the anamorphic genera Helicoma Corda, Helicomyces, and Helicosporium Nees were close relatives, clustering with 100% bootstrap support in a clade designated 'Tubeufiaceae s. str.' (Tsui and Berbee 2006). ...
... In both cases the new sequences were identical to the original ones in GenBank, confirming our conclusions. According to the circumscription of Réblová and Barr (2000) pseudothecia of Acanthostigma bear setae but those of Tubeufia do not and T. asiana has unbranched setae. Our results call into question the use of ascomatal setae to distinguish genera. ...
Article
The teleomorph of Aquaphila albicans was discovered on submerged wood collected in Thailand. Its black, soft-textured, setose ascomata, bitunicate asci and hyaline to pale brown, multiseptate ascospores indicated an affinity to Tubeufiaceae (Dothideomycetes). After morphological or molecular comparisons with related species in Tubeufia, Acanthostigma and Taphrophila, it is described and illustrated as a new species, T. asiana Sivichai & K.M. Tsui, sp. nov. Finding this Tubeufia teleomorph was surprising, given the falcate conidia of its A. albicans anamorph, which superficially resemble the conidia of Fusarium and not the coiled, helicosporous conidia of other species in Tubeufiaceae. We assessed the phylogenetic relationships of A. albicans-T. asiana with ribosomal sequences from SSU and ITS and partial LSU regions by parsimony and Bayesian analysis. An initial set of 40 taxa representing a wide range of ascomycete families and their SSU sequences from GenBank showed A. albicans-T. asiana to be nested within the Tubeufiaceae with 100% bootstrap support. Their placement was inferred with ITS and partial LSU ribosomal sequences. The nearly identical ITS sequences of two isolates of A. albicans and one isolate of Tubeufia asiana united these fungi as a monophyletic group with 100% bootstrap support and further nested them, with 88% bootstrap support, in a clade containing Helicoon gigantisporum and Helicoma chlamydosporum. This is the first molecular phylogenetic study to place a nonhelicosporous species within the Tubeufiaceae and to show that helical conidia were lost at least once within the family.
... Acanthostigma revocatum Sacc. Réblová and Barr (2000) A. minutum var. minutum (Fuckel) Sacc. ...
Article
This study deals with an extensive taxonomic reevaluation focusing on phylogenetic relationships and morphological characterization of Tubeufiales, especially those helicosporous hyphomycetes which are difficult to identify. Based on evidence from DNA sequence data and morphology, we introduce 13 new genera in the family Tubeufiaceae, viz. Acanthotubeufia, Dematiohelicoma, Dematiohelicomyces, Dematiohelicosporum, Dematiotubeufia, Helicoarctatus, Helicohyalinum, Helicotruncatum, Neochlamydotubeufia, Neohelicoma, Pleurohelicosporium, Pseudohelicomyces and Pseudohelicoon; transfer Chaetosphaerulina from Dothideomycetes genera incertae sedis, and Artocarpomyces and Helicodochium from Ascomycetes genera incertae sedis into Tubeufiaceae; introduce 52 new species, viz. Berkleasmium fusiforme, B. longisporum, Chlamydotubeufia cylindrica, Dematiohelicosporum guttulatum, Helicoarctatus aquaticus, Helicodochium aquaticum, Helicohyalinum infundibulum, Helicoma aquaticum, H. brunneisporum, H. cocois, H. rufum, H. fusiforme, H. longisporum, H. multiseptatum, H. rubriappendiculatum, H. septoconstrictum, H. tectonae, Helicomyces hyalosporus, Helicosporium aquaticum, H. flavisporum, H. setiferum, H. vesicarium, H. viridiflavum, Neochlamydotubeufia fusiformis, Neohelicomyces hyalosporus, Neohelicosporium acrogenisporum, N. astrictum, N. ellipsoideum, N. irregulare, N. krabiense, N. laxisporum, N. ovoideum, Pleurohelicosporium parvisporum, Pseudohelicomyces aquaticus, P. hyalosporus, Tubeufia abundata, T. bambusicola, T. brevis, T. brunnea, T. chlamydospora, T. dictyospora, T. eccentrica, T. fangchengensis, T. hechiensis, T. inaequalis, T. krabiensis, T. rubra, T. sessilis, T. sympodihylospora, T. sympodilaxispora, T. taiwanensis and T. tratensis; provide 43 new combinations, viz. Acanthohelicospora guianensis, Acanthotubeufia filiforme, Berkleasmium aquatica, B. guangxiense, B. latisporum, B. thailandicum, Dematiohelicoma perelegans, D. pulchrum, Dematiohelicomyces helicosporus, Dematiotubeufia chiangraiensis, Helicohyalinum aquaticum, Helicoma elinorae, H. gigasporum, H. hongkongense, H. linderi, H. nematosporum, H. pannosum, H. serpentinum, Helicomyces chiayiensis, Helicotruncatum palmigenum, Neochlamydotubeufia khunkornensis, Neohelicoma fagacearum, Neohelicomyces pallidus, Neohelicosporium abuense, N. aurantiellum, N. griseum, N. morganii, N. myrtacearum, N. nizamabadense, N. sympodiophorum, N. taiwanense, N. vesiculiferum, Pseudohelicomyces indicus, P. paludosus, P. talbotii, Pseudohelicoon gigantisporum, P. subglobosum, Tubeufia dentophora, T. geniculata, T. lilliputea, T. machaerinae, T. sympodiophora and T. xylophila; introduce 16 new records, viz. Dictyospora thailandica, Helicomyces colligatus, H. torquatus, Neohelicosporium guangxiense, N. hyalosporum, N. parvisporum, Thaxteriellopsis lignicola, Tubeufia aquatica, T. chiangmaiensis, T. cylindrothecia, T. filiformis, T. guangxiensis, T. laxispora, T. parvispora, T. roseohelicospora and T. tectonae. The taxonomy of Helicoma, Helicomyces and Helicosporium is revisited based on phylogenetic analyses and morphological evidence. Neorhamphoria is transferred to Bezerromycetaceae. Three species are excluded from the genus Chlamydotubeufia, twelve species from Helicoma, four species from Helicomyces, 25 species from Helicosporium, six species from Neoacanthostigma and one species from Tubeufia. A multi-gene phylogenetic tree based on maximum likelihood and Bayesian analyses of ITS, LSU, RPB2 and TEF1α sequence data of species of Tubeufiales is provided. Detailed descriptions and illustrations are provided, as well as the morphological comparison with similar taxa are explored. The checklist of accepted Tubeufiales species and re-organised Tubeufiales species are provided.
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Numerous new taxa and classifications of Dothideomycetes have been published following the last monograph of families of Dothideomycetes in 2013. A recent publication by Honsanan et al. in 2020 expanded information of families in Dothideomycetidae and Pleosporomycetidae with modern classifications. In this paper, we provide a refined updated document on orders and families incertae sedis of Dothideomycetes. Each family is provided with an updated description, notes, including figures to represent the morphology, a list of accepted genera, and economic and ecological significances. We also provide phylogenetic trees for each order. In this study, 31 orders which consist 50 families are assigned as orders incertae sedis in Dothideomycetes, and 41 families are treated as families incertae sedis due to lack of molecular or morphological evidence. The new order, Catinellales, and four new families, Catinellaceae, Morenoinaceae Neobuelliellaceae and Thyrinulaceae are introduced. Seven genera (Neobuelliella, Pseudomicrothyrium, Flagellostrigula, Swinscowia, Macroconstrictolumina, Pseudobogoriella, and Schummia) are introduced. Seven new species (Acrospermum urticae, Bogoriella complexoluminata, Dothiorella ostryae, Dyfrolomyces distoseptatus, Macroconstrictolumina megalateralis, Patellaria microspora, and Pseudomicrothyrium thailandicum) are introduced base on morphology and phylogeny, together with two new records/reports and five new collections from different families. Ninety new combinations are also provided in this paper.
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