Pleosporales » Lophiostomataceae

Dimorphiopsis

Dimorphiopsis Crous, in Crous et al., Persoonia 31: 217 (2013)

 Index Fungorum number: IF 805832; Facesoffungi number: FoF 01783, 1 morphological species (Species Fungorum 2021), 1 species with molecular data.

Saprobic or pathogenic on leaf. Sexual morph: Unknown. Asexual morph: Mycelium consisting of pale to brown, septate, branched, smooth, 2–3 µm diam hyphae, at times with intercalary chlamydospore-like cells. Conidiomata vary from immersed pycnidia to superficial sporodochia, opening by irregular rupture of wall, globose to irregular. Conidiomatal wall not clearly distinguishable, consisting of globose, aseptate, medium brown cells that are densely aggregated but not clearly attached, forming conidia inwardly towards centrum of conidioma. Conidiogenous cells dissolving early, aggregated, hyaline to pale brown, smooth, ampulliform to globose, with inconspicuous terminal, phialidic openings. Conidia solitary, pale brown when immature, becoming dark brown, roughened to warty, golden to dark brown, medianly 1-distoseptate, thick walled, ellipsoid, constricted at septum, with obtuse ends, and flattened basal scar (Adapted from Crous et al. 2013).

 

Type species: Dimorphiopsis brachystegiae Crous

 

Notes: Dimorphiopsis was introduced by Crous et al. (2013) with D. brachystegiae as type species. Dimorphiopsis is characterized by immersed pycnidia to superficial sporodochia, globose to irregular, ellipsoid conidia, golden to dark brown, roughened to warty and flattened basal scar. On PNA, the genus forms a hyphomycete with sporodochia on sterile pine needles, but on water agar it appears as a coelomycete with immersed conidiomata. Dimorphiopsis is morphologically a distinct genus. Phylogenetically, Dimorphiopsis is a well-supported genus in Lophiostomataceae.

 

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