Pleosporales » Dictyosporiaceae

Gregarithecium

Gregarithecium Kaz. Tanaka & K. Hiray., in Tanaka et al., Stud. Mycol. 82: 88 (2015).

Index Fungorum number: IF 811298; Facesoffungi number: FoF 08213, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Saprobic on host. Sexual morph: Ascomata grouped, immersed to erumpent, depressed globose to hemispherical with flattened base in section. Ostiolar neck short terete, central, with periphyses, covered by black clypeus. Ascomatal wall composed of thin-walled cells, surrounded by vertically-orientated stromatic tissue. Pseudoparaphyses septate, branched and anastomosed. Asci fissitunicate, cylindrical, short-stalked, with 8 2-seriate ascospores. Ascospores broadly fusiform, with a median septum, hyaline, smooth, surrounded by an entire sheath. Asexual morph: Unknown (adapted from Tanaka et al. 2015).

Type species: Gregarithecium curvisporum Kaz. Tanaka & K. Hiray.

Notes: Gregarithecium is characterised by immersed to erumpent ascomata, branched and anastomosed pseudoparaphyses, cylindrical, short-stalked asci and hyaline, smooth, fusiform ascospores surrounded by an entire sheath. Gregarithecium resembles Massarina sensu lato in having depressed globose ascomata with clypeate ostiole but differs in that the former genus has stromatic tissue surrounding the ascomata. Gregarithecium belongs to Dictyosporiaceae while Massarina sensu lato is polyphyletic and has been separated into different genera in other families such as Lentitheciaceae, Morosphaeriaceae, Trematosphaeriaceae, Tetraplosphaeriaceae and Lindgomycetaceae. Gregarithecium is a distinct genus in Dictyosporiaceae but more collections are needed together with molecular data to confirm the status of genera in the family. Molecular markers available for Gregarithecium are ITS, LSU, SSU and TEF-1.

 

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