Pleosporales » Phaeosphaeriaceae

Populocrescentia

Populocrescentia Wanas., E.B.G. Jones & K.D. Hyde, in Ariyawansa et al., Fungal Diversity 75: 111 (2015).

Index Fungorum number: IF 551411; Facesoffungi number: FoF 00952, 3 morphological species (Species Fungorum 2022), 3 species with molecular data.

Saprobic on dead herbaceous branches in terrestrial habitats. Sexual morph: Ascomata solitary, scattered, immersed to semi-erumpent, globose or subglobose, dark brown to black, coriaceous, cupulate when dry, ostiolate. Ostiole papillate, black, smooth, ostiolar canal filled with sparse periphyses. Peridium comprising 6–8 layers, outer part heavily pigmented, thick-walled, comprising blackish to dark brown cells of textura angularis, inner part composed of hyaline, thin-walled cells of textura angularis. Hamathecium comprising 2–3 μm wide, filamentous, branched septate, cellular pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindrical to cylindric clavate, short pedicellate, rounded and thick-walled at the apex, with a minute ocular chamber. Ascospores overlapping 1–2-seriate, initially hyaline, becoming yellowish brown at maturity, broad fusiform, muriform, deeply constricted at the middle septum, slightly constricted at the remaining septa. Asexual morph: Unknown (adapted from Ariyawansa et al. 2015).

 Type species: Populocrescentia forlicesenensis Wanas., Camporesi, E.B.G. Jones & K.D. Hyde

            Notes: Populocrescentia is characterised by scattered, immersed to semi-erumpent, globose or subglobose ascomata, papillate, black, smooth ostiole, cylindrical to cylindric clavate, short pedicellate asci and overlapping 1–2-seriate hyaline to yellowish brown muriform ascospores. Populocrescentia resembles Dematiopleospora in having a flat cupulate, globose to subglobose ascomata, a minute papilla, cylindrical asci and muriform ascospores but can be differentiated in that Dematiopleospora has a wide, brown, periphysate ostiole, subfusiform ascospores with the upper part widest and light end cells (Ariyawansa et al. 2015). Populocrescentia also resembles Allophaeosphaeria but can be differentiated in the peridium arrangement and papillate ostioles. Populocrescentia is morphologically and phylogenetically a distinct genus in Phaeosphaeriaceae. Molecular markers available for Populocrescentia are ITS, LSU, SSU and TEF-1.

 

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