Pleosporales » Pleosporaceae


Platysporoides (Wehm.) Shoemaker & C.E. Babc., Can. J. Bot. 70(8): 1648 (1992).

Index Fungorum number: IF 22438; Facesoffungi number: FoF 00532, 11 morphological species (Species Fungorum, 2022), molecular data unavailable.

Saprobic in terrestrial habitats. Sexual morph: Ascomata small, scattered, immersed, semi-immersed to nearly superficial, globose, subglobose, black, smooth; apex with a protruding papilla and pore-like ostiole, without periphyses. Peridium thin, composed of a few layers of textura angularis. Hamathecium of numerous, cellular pseudoparaphyses, anastomosing above the asci, septate. Asci bitunicate, fissitunicate, cylindrical to cylindro-clavate, with a short, furcate pedicel and minute ocular chamber. Ascospores broadly ellipsoid, reddish brown, muriform. Asexual morph: undetermined (adapted from Ariyawansa et al. 2014).


Type species: Platysporoides chartarum (Fuckel) Shoemaker & C.E. Babc.


Notes: Platysporoides was initially introduced as a subgenus of Pleospora by Wehmeyer (1961) with P. chartarum as type species. Platysporoides was raised to generic rank by Shoemaker and Babcock (1992) and placed in Pleosporaceae based on the Bapplanodictyospore and Bterete pored beak of the ascomata.  Platysporoides is characterized by small, scattered, immersed, semi-immersed to nearly superficial, globose, subglobose, black ascomata, cylindrical to cylindro-clavate asci and broadly ellipsoid, reddish brown, muriform ascospores. Platysporoides differs from Diadema in having ascomata opening via an intraepidermal discoid lid (Shoemaker & Babcock, 1992). Platysporoides resembles Aigialus in having flattened and muriform ascospores ascomata with papilla and ostioles but the latter genus belongs to Aigialaceae and is phylogenetically distinct from Platysporoides (Suetrong et al., 2009). Ariyawansa et al. (2014) re-examined the holotype specimen of P. chartarum (HUH 00290381) from Germany and placed Platysporoides in Pleosporaceae based on morphology namely globose to subglobose ascomata with pore-like ostiole, a peridium comprising layers of textura angularis, cellular pseudoparaphyses, fissitunicate, cylindrical to cylindro-clavate asci with broadly ellipsoid, reddish brown, muriform ascospores. Platysporoides is morphologically and phylogenetically a distinct genus in Pleosporaceae. Molecular data is lacking for the genus. Fresh collections with DNA sequence data is needed to confirm the taxonomic placement of the genus.


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