Pseudopenidiella Crous & Koukol, in Crous et al., Persoonia 28: 167 (2012).
Index Fungorum number: IF 800382; Facesoffungi number: FoF 06757, 3 morphological species (Species Fungorum 2022), 2 species with molecular data.
Saprobic on host. Sexual morph: Unknown. Asexual morph: Mycelium consisting of pale brown, finely verruculose, branched, septate hyphae. Conidiophores dimorphic: micro conidiophores reduced to conidiogenous cells on hyphae, visible as slight thickenings on hyphal cells, somewhat erumpent, pale brown, apex truncate. Macroconidiophores subcylindrical with slight apical taper, pale brown to brown, erect, solitary on hyphae, unbranched, with one basal septum, or multi-septate, base somewhat swollen, lacking rhizoids, smooth, but becoming verruculose towards apical conidiogenous cell. Conidiogenous cells terminal, obtusely rounded to clavate, finely verruculose, pale brown; loci apical, 1–3 per conidiogenous cell, inconspicuous, somewhat flattened, truncate. Ramoconidia pale brown, finely verruculose, subcylindrical to fusoid-ellipsoid, aseptate, giving rise to branched chains of conidia. Conidia finely verruculose, pale brown, subcylindrical to ellipsoid, aseptate; hila inconspicuous, truncate, not thickened nor darkened (adapted from Crous et al. 2012).
Type species: Pseudopenidiella piceae Crous & Koukol
Notes: Pseudopenidiella is characterised by dimorphic conidiophores, subcylindrical macroconidiophores, obtusely rounded to clavate conidiogenous cells, pale brown, finely verruculose, subcylindrical to fusoid-ellipsoid ramoconidia and finely verruculose, pale brown, subcylindrical to ellipsoid, aseptate conidia. Pseudopenidiella differs from Cladosporium in lacking coronate-type scars on its conidial hila or conidiogenous cells. Pseudopenidiella resembles Digitopodium, but can be differentiated based on the absence of rhizoids, presence of ramoconidia, and conidia. Pseudopenidiella is also similar to Penidiella in having penicillate conidiophores but differs in having aseptate conidia, absence of darkened, slightly thickened scars on its conidial scars and hila (Crous et al. 2007b; Bensch et al. 2012). Molecular markers available for Pseudopenidiella in GenBank are ITS, LSU and SSU. Pseudopenidiella is a distinct and well-defined genus in Microthyriaceae.