Westerdykella Stolk, Trans. Br. mycol. Soc. 38(4): 422 (1955).
Index Fungorum number: IF 5772; Facesoffungi number: FoF 06570, 13 morphological species (Species Fungorum 2022), 7 species with molecular data.
Pathogenic or saprobic on host. Sexual morph: Cleistothecia discrete, occurring in the upper layer of the culture medium, generally forming below a dense mat of hyphae exuding clear exudates, globose, glabrous and brownish black to black. Perithecia globose, black. Perithecium wall membranaceous, consisting of one layer of brown to black thick-walled cells. Asci initially slightly clavate, later, becoming globose to subglobose, seldom ovoid when mature, containing 32 ascospores. Ascospores brown to black, glabrous, noticeably reniform to globose in shape, having a central groove on the concave side without oil droplets or germ-slits, provided with spiral bands. Asexual morph: Unknown (adapted from Ebead et al. 2012 and Stolk 1955).
Type species: Westerdykella ornata Stolk
Notes: Kruys and Wedin (2009) retypified Westerdykella. Westerdykella differs from similar genera in the family Sporormiaceae by the production of cleistothecioid ascomata containing small asci (< 50 μm tall) with a short or almost absent stipe, encasing one-celled ascospores without germ slits. Westerdykella is morphologically and phylogenetically a distinct and well-supported genus in Sporormiaceae. Molecular markers available for Westerdykella are ITS, LSU, SSU, BTUB, RPB2, TEF-1 and mtSSU.
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