Penidiellopsis Sand. -Den., Gené, Deanna A. Sutton & Guarro, in Crous et al., Persoonia 36: 439 (2016).
Index Fungorum number: IF 815361; Facesoffungi number: FoF 07028, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.
Pathogenic on human nail. Sexual morph: Unknown. Asexual morph: Conidiophores differentiated, solitary, erect, straight to geniculate-sinuous, rarely branched, pale to medium brown, smooth and thick-walled. Conidiogenous cells integrated, terminal or intercalary, pale to medium brown, smooth, mono- and polyblastic, giving rise to one or more sets of ramoconidia, scars truncate, slightly darkened, unthickened and not refractive. Ramoconidia 0–1-septate, obovoid, ellipsoid or slightly clavate, pale to medium brown, smooth- and thick-walled, apical part with denticle-like loci, basal scar flattened, slightly darkened, unthickened and not refractive. Conidia in branched acropetal chains, 0-septate, obovoid, ellipsoid or limoniform, pale to medium brown, smooth, thick-walled, with conidial scars truncate or protuberant, somewhat darkened, unthickened and not refractive (adapted from Crous et al. 2016).
Type species: Penidiellopsis radicularis Sandoval-Denis, Gené, Deanna A. Sutton & Guarro
Notes: Penidiellopsis resembles Penidiella but Penidiellopsis is distinct in having unbranched conidiophores, though the conidial chains show continuous bi- or trifurcating elongation pattern (Crous et al. 2007). Penidiellopsis is unique in producing shorter ramoconidia. Penidiellopsis is a well-supported genus in Teratosphaeriaceae. Molecular markers available for Penidiellopsis are ITS, LSU, BTUB, Calmodulin and TEF-1.
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