Protostegia
Protostegia Cooke, Grevillea 9 (no. 49): 19 (1880).
Index Fungorum number: IF 9540; Facesoffungi number: FoF 08550, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.
Pathogenic showing as leaf spots. Sexual morph: Unknown. Asexual morph: Conidiomata immersed becoming somewhat erumpent, solitary, exuding a mucoid conidial cirrhus, pale brown, splitting the leaf surface, with central ostiole; wall of brown textura intricata. Conidiophores reduced to conidiogenous cells. Conidiogenous cells hyaline, smooth, lining the inner cavity, lageniform to subcylindrical, proliferating per currently at apex. Conidia hyaline, smooth, scolecosporous, euseptate (adapted from Crous et al. 2015).
Type species: Protostegia eucleae Kalchbr. & Cooke
Notes: Protostegia is characterised by immersed conidiomata with walls of textura intricata, splitting the epidermis and looking like acervular with a well-developed ostiole. Crous et al. (2015) epitypified Protostegia with a specimen collected on Euclea undulata (Ebenaceae) from South Africa. Protostegia is closely related to Cytostagonospora but the latter is characterised by percurrent and polyphialidic conidiogenous cells, and solitary to aggregated conidiomata embedded in stromatic tissue (Quaedvlieg et al. 2013). Protostegia has also been compared to Phaeophleospora but the latter differs in producing pigmented conidiogenous cells and conidia. Protostegia is a distinct and well-supported genus in Mycosphaerellaceae. Molecular markers available for Protostegia are ITS, LSU, Actin, BTUB, Histone, RPB2 and TEF-1.
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