Vizellopsis
Vizellopsis Bat., J.L. Bezerra & T.T. Barros, Publicações Inst. Micol. Recife 637: 5 (1969).
Index Fungorum number: IF 5748; Facesoffungi number: FoF 06746, 1 morphological species (Species Fungorum 2022), no molecular data available.
Epiphytic on upper surface of living leaves. Colonies 1–2 mm diam. superficial, thin, circular, dark brown to black, without hyphopodia. Hyphae long, 7–13 µm wide, flexuous, reticulately branched, septate, dark brown, strongly constricted and dark at the septa, straight or curved. Sexual morph: Thyriothecia forming below the mycelium, scattered to gregarious, superficial, aggregated in the center of colonies, orbicular, flattened, black, ostiolate in the center, opening by irregular splitting when mature, membranaceous to slightly coriaceous, easy removed from host surface. Upper wall comprising cells of textura prismatica, radiating outwardly in parallel rows from the central ostiole, basal wall layer poorly developed. Hamathecium composed of dense, septate, branched pseudoparaphyses and asci inclined from the base and rim towards the central ostiole. Asci 8-spored, bitunicate, clavate, pedicel poorly developed, apically rounded with an ocular chamber. Ascospores 2–3-seriate, irregularly arranged, broad fusiform to long obovoid, brown, uniseptate, smooth-walled. Asexual morph: Unknown (adapted from Dai et al. 2014).
Type species: Vizellopsis grevilleae Bat., J.L. Bezerra & T.T. Barros
Notes: Vizellopsis is characterised by orbicular, flattened, black thyriothecia, upper wall comprising cells of textura prismatica, bitunicate, clavate asci and broad fusiform to long obovoid, brown, uniseptate ascospores. Batista et al. (1969) treated Vizellopsis in Microthyriaceae, based on the black, circular, flattened thyriothecia. Lumbsch and Huhndorf (2010) included Vizellopsis in Dothideomycetes incertae sedis, as the morphological characters are not typical of Microthyriaceae. Dai et al. (2014) re-examined the holotype specimen of V. grevilleae and placed it in Asterinaceae based on the small, black thyriothecia formed underneath the dark brown mycelium consisting of radiating cells and having concentrically ridged surface. Vizellopsis has strongly thickened and septate mycelium which is different from other genera of Asterinaceae. Vizellopsis is a distinct genus in Asterinaceae but fresh collections and DNA sequence data is needed to confirm this taxonomic placement.
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