Vrystaatia
Vrystaatia Quaedvl., W.J. Swart, Verkley & Crous, Stud. Mycol. 75: 372 (2013).
Index Fungorum number: IF 804448; Facesoffungi number: FoF 00275, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Foliicolous. Sexual morph: Unknown. Asexual morph: Conidiomata black, globose, pycnidial with central, dark brown ostiolar area, substomatal on host, erumpent in culture; wall of 6-8 layers of pale brown textura angularis; exuding cirrhus of orange conidia. Conidiophores reduced to conidiogenous cells. Conidiogenous cells lining the inner cavity of conidioma, globose to ampulliform, rarely allantoid, hyaline, smooth; with prominent periclinal thickening, or proliferating several times per currently near apex, giving rise to macro- and microconidia. Macroconidia solitary, hyaline, smooth, guttulate, subcylindrical to narrowly obclavate or acicular, apex obtuse to subobtuse, base truncate to long obconically truncate, conidia widest at or just above basal septum, transversely euseptate. Microconidia hyaline, smooth, aseptate, pear-shaped to globose or ellipsoid, apex obtuse, base truncate (adapted from Quaedvlieg et al. 2013).
Type species: Vrystaatia aloicola Quaedvl., Verkley, W.J. Swart & Crous
Notes: Vrystaatia is characterised by black, globose conidiomata, globose to ampulliform, rarely allantoid, hyaline conidiogenous cells, solitary, hyaline, smooth, guttulate, subcylindrical to narrowly obclavate or acicular macroconidia and hyaline, smooth, aseptate, pear-shaped to globose or ellipsoid microconidia. Vrystaatia differs from Septoria s. str. in having phialidic conidiogenous cells that form percurrently or with prominent periclinal thickening and produce macro- and microconidia in culture while Septoria has holoblastic conidiogenous cells proliferating sympodially and/or percurrently. Vrystaatia is a distinct and well-supported genus in Phaeosphaeriaceae. Molecular markers available for Vrystaatia are ITS, LSU, BTUB and RPB2.
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