Annulatascales » Annulatascaceae



Annulatascus K.D. Hyde, Aust. Syst. Bot. 5(1): 118 (1992)

             Diaporthomycetidae, Annulatascales, Annulatascaceae, Annulatascus

          Index Fungorum number: IF25398; Facesoffungi number: FoF 01213; 17 morphological species; 7 species with sequence data


Saprobic on submerged wood. Sexual morph: Ascomata perithecial, scattered or densely aggregated in patches, immersed, partially superficial, brown to black, ostiolate, unilocular, rarely clypeate, globose to subglobose, ellipsoidal. Ostiolar necks cylindrical to conical, black, periphysate. Peridium carbonaceous or coriaceous composed of cells of textura angularis or pseudoparenchymatous, or melanized angular cells. Paraphyses numerous, septate, branched or unbranched, tapering. Asci 8-spored, unitunicate, cylindrical, pedicellate, usually with a massive J-, refractive, cylindrical to flaring, doughnut-shaped, apical ring. Ascospores usually uniseriate, sometimes overlapping, hyaline to pale yellow or brown, ellipsoidal to oval or fusiform or lunate or citriform, unicellular or septate, septa mostly transverse, smooth or roughed, with or without appendages, mucilaginous sheath and germ pores. Asexual morph: Hyphomycetous. taeniolella-like for Chaetorostrum where Conidiophores are micronematous, mononematous. Conidia monoblastic, elongate cylindrical, trans-septate, euseptate, brown, paler near the apex. Conidial secession schizolytic (adapted from Maharachchikumbura et al. 2016).


Type species: Annulatascus velatisporus K.D. Hyde, Aust. Syst. Bot. 5(1): 118 (1992).


Notes: Annulatascus is the type genus of Annulatascaceae and was introduced by Hyde (1992) based on two tropical freshwater taxa, A. velatispora as the type species and A. bipolaris. However, the holotype of A. velatisporus was in poor condition as herbarium material had only a few ascomata. Thus, Dayarathne et al. (2016) designated an epitype, which was collected from submerged wood in a river, at Millaa Millaa Falls, north Queensland, Australia, based on morphological examination and DNA sequences. Molecular data have demonstrated that this genus is polyphyletic (Abdel-Wahab et al. 2011, Luo et al. 2015) and confirmed that placement of species in this genus based solely on the relatively massive apical ascal ring is not very reliable (Abdel-Wahab et al. 2011, Luo et al. 2015). In phylogenetic analyses conducted by Hyde et al. (2020), Annulatascus nilensis did not cluster within Annulatascus, but was basal to Ascitendus, Longicollum and Submersisphaeria with low bootstrap support. Annulatascus nilensis also formed a weakly-supported clade with members of Annulatascus (Abdel-Wahab et al. 2011, Luo et al. 2019). Fresh collections and multigene phylogenies are needed to resolve the taxonomy of this group of fungi.



Species illustrated in this entry

Annulatascus thailandensis W. Dong, H. Zhang & K.D. Hyde

Annulatascus velatisporus K.D. Hyde




Abdel-Wahab MA, Abdel-Aziz FA, Mohamed SS, Abdel-Aziz AE. 2011 – Annulatascus nilensis sp. nov., a new freshwater ascomycete from the River Nile, Egypt. IMA Fungus 2, 1–6.

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

Ho WH, Tsui CKM, Hodgkiss IJ, Hyde KD. 1999 – Aquaticola, a new genus of Annulatascaceae from freshwater habitats. Fungal Diversity 3, 87–97.

Hyde KD, Norphanphoun C, Maharachchikumbura SSN, Bhat DJ et al. 2020 Refined families of Sordariomycetes. Mycosphere 11, 3051059.

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.

Luo ZL, Hyde KD, Liu JK, Maharachchikumbura SSN et al. 2019 – Freshwater Sordariomycetes. Fungal Diversity 99, 451–660.

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.

Maharachchikumbura SSN, Hyde KD, Jones EBG, McKenzie EHC et al. 2016 – Families of Sordariomycetes. Fungal Diversity 79, 1–317.


About Sordariomycetes

The webpage Sordariomycetes provides an up-to-date classification and account of all genera of the class Sordariomycetes.


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