Fungalpedia – Note 872, Annulatascus

 

Annulatascus K.D. Hyde

Citation when using this data: Dong W et al. 2021 (in prep.) – Fungalpedia, Ascomycota.

Index Fungorum, Facesoffungi, MycoBank, GenBank., Fig 1

Classification: Annulatascaceae, Annulatascales, Diaporthomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi

Notes – Annulatascus was introduced by Hyde (1992) with A. velatisporus as the type species. Considering the poor condition and the dearth of sequence data of the holotype, an epitype of A. velatisporus was designated with a morphological description and DNA sequence data for the precise delineation of this taxon (Dayarathne et al. 2016). Dayarathne et al. (2016) observed smaller Ranghoo et al. (1999) and Raja et al. (2003). Three strains PE0011-9a, PE0011-9b and PE0011-9c were sequenced by Dayarathne et al. (2016), but their morphs were not specifically described and illustrated in the dissertation of Zelski (2015). Because these six strains were not formally published and our preliminary multigene analysis show that they are phylogenetically different species to A. velatisporus, we exclude them and retain the ex-epitype strains of A. velatisporus (MFLU 16-2204 and MFLUCC 16-1441).

Annulatascus comprises 20 epithets in Index Fungorum (2021) and its polyphyletic nature has been shown in previous studies (Luo et al. 2015, Zhang et al. 2017, Hyde et al. 2020) and in this study. The latest treatment for Annulatascus was provided by Hyde et al. (2020). The phylogenetic placements of most Annulatascus species have not been confirmed by molecular data. Presently, six sequenced species of Annulatascus cluster in Annulatascaceae, but A. aquatorbae and A. nilensis are phylogenetically distant from the type species A. velatisporus (Luo et al. 2015, Hyde et al. 2020, this study). Based on morphology and phylogeny, A. aquatorbae and A. nilensis are excluded from Annulatascus and transferred to two new genera, Fusoidigranularius and Longivarius, respectively (see notes under Fusoidigranularius and Longivarius). In addition, we introduce three new species in Annulatascus, which were collected from submerged wood in freshwater in Thailand.

Type species – Annulatascus velatisporus K.D. Hyde.

Other accepted species: Species Fungorum – search Annulatascus.

 

23A

 

Figure 1 – Annulatascus chiangmaiensis (MFLU 17-1708, holotype). a, b Ascomata on host substrate. c Vertical section of ascoma. d Structure of neck. e Structure of peridium.
f–h Unitunicate asci. i Paraphyses. j Apical ring. k–m Ascospores (l note the bipolar apiculi).
n Germinated ascospore. Scale bars: c–i = 50 μm, j–m = 15 μm, n = 30 μm.

 

References

Dayarathne M, Maharachchikumbura S, Phookamsak R, Fryar S et al. 2016 – Morpho-molecular characterization and epitypification of Annulatascus velatisporus. Mycosphere 7, 1389–1398.

Hyde KD. 1992 – Tropical Australian freshwater fungi. II. Annulatascus velatispora gen. et sp. nov., A. bipolaris sp. nov. and Nais aquatica sp. nov. (Ascomycetes). Australian Systematic Botany 5, 117–124.

Hyde KD, Norphanphoun C, Maharachchikumbura SSN, Bhat DJ et al. 2020 – Refined families of Sordariomycetes. Mycosphere 11, 305–1059.

Luo ZL, Maharachchikumbura SSN, Liu XY, Chen LJ et al. 2015 – Annulatascus saprophyticus sp. nov. and Pseudoannulatascus gen. nov. to accommodate Annulatascus biatriisporus (Annulatascales, Sordariomycetes) from Thailand. Phytotaxa 239, 174–182.

Raja HA, Campbell J, Shearer CA. 2003 – Freshwater ascomycetes: Cyanoannulus petersenii, a new genus and species from submerged wood. Mycotaxon 88, 1–17.

Ranghoo VM, Hyde KD, Liew ECY, Spatafora JW. 1999 – Family placement of Ascotaiwania and Ascolacicola based on DNA sequences from the large subunit rRNA gene. Fungal Diversity 2, 159–168.

Zelski SE. 2015 – A monograph of the freshwater ascomycete family Annulatascaceae: a morphological and molecular study. Dissertation, University of Illinois.

Zhang H, Dong W, Hyde KD, Maharachchikumbura SSN et al. 2017 – Towards a natural classification of Annulatascaceae-like taxa: introducing Atractosporales ord. nov. and six new families. Fungal Diversity 85, 75–110.

 

Entry by

Wei Dong, Faculty of Agriculture and Food, Kunming University of Science & Technology, Kunming 650500, China, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Innovative Agriculture Research Center, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Center of Excellence for Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Innovative Institute for Plant Health, Zhongkai University of Agriculture and Engineering, Haizhu District, Guangzhou 510225, China

 

Published online 15 February 2021

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