Ormathodium
Ormathodium Syd., Annls mycol. 26(1/2): 138 (1928).
Index Fungorum number: IF 22284; Facesoffungi number: FoF 08634, 2 morphological species (Species Fungorum 2022), no molecular data available.
Leaf spots lacking. Sexual morph: Unknown. Asexual morph: Caespituli hypophyllous, regularly spread, loose to dense, mostly on tips of stellate hairs, rarely on the epidermis. Conidiomata superficial, globose to hemispherical, more rarely irregular, with a basal dense plectenchymatous stroma composed of yellow to olivaceous brown hyphae, equipped with short protuberant free ends (conidiophores) giving rise to simple or dichotomously branched conidial chains. Conidia oblong, often almost cylindrical, more rarely fusiform, olivaceous brown, transversely 1–2-septate, not or only slightly constricted at the septa (adapted from Sydow, 1928; Videira et al., 2017).
Type species: Ormathodium styracis Syd.
Notes: Ormathodium is characterised by hypophyllous, loose to dense caespituli, superficial, globose to hemispherical conidiomata, and oblong-cylindrical, more rarely fusiform, olivaceous brown conidia. Muntanola (1960) considered Ormathodium as a synonym of Mycovellosiella. Crous and Braun (2003) synonymized Ormathodium with Passalora but this was not confirmed with molecular data. The type specimen of O. styracis is lost (Crous & Braun, 2003). The placement of Ormathodium in Mycosphaerellaceae is doubtful. Fresh collections with DNA sequence data are needed to confirm the taxonomic placement of Ormathodium.
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