Pleosporales » Pseudoberkleasmiaceae

Pseudoberkleasmium

Pseudoberkleasmium Tibpromma & K.D. Hyde, in Tibpromma et al., Fungal Diversity: 10.1007/s13225-018-0408-6, [50] (2018).

 Index Fungorum number: IF 555331; Facesoffungi number: FoF 05311, 3 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic on dead or decaying leaves and wood in terrestrial habitats. Sexual morph: Unknown. Asexual morph: Hyphomycetous. Colonies on natural substrate, in small groups, blackish to brown, velvety, glistening, with conidia readily liberated when disturbed. Mycelium immersed in the substrate, composed of branched, septate, smooth, hyaline to subhyaline hyphae. Conidiophores micronematous, mononematous, fasciculate, septate, hyaline or subhyaline. Conidiogenous cells holoblastic, monoblastic, integrated, terminal, determinate, globose, with or without guttules, hyaline to subhyaline. Conidia acrogenous, solitary, broadly ellipsoidal to obovoid, flattened, one-cell thick, muriform, brown olivaceous green, with or without guttules (adapted from Tibpromma et al. 2018).

Type species: Pseudoberkleasmium pandanicola Tibpromma & K.D. Hyde

Notes: Pseudoberkleasmium was introduced by Tibpromma et al. (2018) with P. pandanicola as type species. Pseudoberkleasmium is characterised by blackish to brown colonies, micronematous, mononematous, hyaline or subhyaline hyphae, micronematous, mononematous conidiophores, holoblastic, monoblastic conidiogenous cells and acrogenous, solitary, broadly ellipsoidal to obovoid conidia. Pseudoberkleasmium forms a distinct lineage based on a combined analysis of LSU, SSU, TEF1 and ITS sequence data. Pseudoberkleasmium differs from Hermatomyces in having lenticular and cylindrical conidia (one to two types of conidia) (Chang 1995). Pseudoberkleasmium also resembles Bahugada but can be differentiated based on the funnel or globose shaped conidiogenous cells and brown to olivaceous green conidia, typically with a globose attached conidiogenous cell while Bahugada is characterised by sympodial and denticulate conidiogenous cells and dark brown conidia (Reddy & Rao 1984). Pseudoberkleasmium differs from Berkleasmium in having obovoid conidia with a scar or hilum at the base and cylindrical conidiogenous cells with a dark apex (Tanney & Miller 2017, Tibpromma et al. 2018). Pseudoberkleasmium is phylogenetically distinct from Berkleasmium and the latter is polyphyletic with taxa clustering in several clades. Phukhamsakda and Hyde in Hyde et al. (2019) introduced the new family Pseudoberkleasmiaceae to accommodate Pseudoberkleasmium based on phylogeny. Pseudoberkleasmium is morphologically and phylogenetically a distinct genus in its own family Pseudoberkleasmiaceae. Molecular markers available for Pseudoberkleasmium are ITS, LSU, SSU, RPB2 and TEF-1.

 

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