Dothideomycetes » Dothideomycetes, genera incertae sedis

Dothideopsella

Dothideopsella Höhn., Sber. Akad. Wiss. Wien, Math. -naturw. Kl., Abt. 1 124: 70 (1915).

Index Fungorum number: IF 1696; Facesoffungi number: FoF 00295, 2 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic on dead wood and stems in terrestrial habitats. Sexual morph: Ascomata scattered, gregarious, immersed to semi-immersed, or erumpent, nearly superficial, globose, uniloculate, subglobose or obypyriform, glabrous, dark brown to black, ostiole central, broadly or narrowly conical, with a dark brown to black papilla. Peridium thin to thick, of unequal thickness, slightly thick at the basal ascoma, composed of dark brown to black, thin-walled, pseudoparenchymatous cells, arranged in a textura angularis. Hamathecium composed of numerous, filamentous, distinctly septate, cellular pseudoparaphyses, anastomosing without a gelatinous coating. Asci 8-spored, bitunicate, fissitunicate, cylindrical to oblong, with a knob like pedicel, apically rounded with well-developed ocular chamber. Ascospores phragmosporous, ellipsoidal to fusiform, brown or yellowish brown, septate, slightly constricted at the septum, smooth-walled. Asexual morph: Unknown (adapted from Ariyawansa et al. 2013).

 Type species: Dothideopsella agminalis (Sacc. & Morthier) Höhn.

Notes: Dothideopsella is characterised by gregarious, immersed to semi-immersed ascomata, cylindrical to oblong asci with knob like pedicel, and phragmosporous, ellipsoidal to fusiform, brown or yellowish brown ascospores. Ariyawansa et al. (2013) re-examined the holotype specimen of D. agminalis from ILL, and referred Dothideopsella to Phaeosphaeriaceae based on morphological similarities with Chaetoplea. Dothideopsella differs from Chaetoplea in having a peridium comprising pseudoparenchymatous cells while Chaetoplea has peridium comprising scleroplectenchymatous cells. This placement was followed by Wijayawardene et al. (2014) and Phookamsak et al. (2014). Molecular data is lacking for Dothideopsella. Wijayawardene et al. (2017, 2020) and Hongsanan et al. (2020b) listed Dothideopsella in Dothideomycetes genera incertae sedis. Fresh collections with DNA sequence data are needed to confirm the generic placement of Dothideopsella.

 

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