Acrospermales » Acrospermales genus incertae sedis


Pseudovirgaria H.D. Shin, U. Braun, Arzanlou & Crous, in Arzanlou et al., Stud. Mycol. 58: 87 (2007).

Index Fungorum number: IF 504564; Facesoffungi number: FoF 06853, 2 morphological species (Species Fungorum 2022), 1 species with molecular data.

Hyperparasitic on rust fungi. Sexual morph: Unknown. Asexual morph: In vivo: Colonies predominantly on telia (less so on uredinia), thin to moderately thick, loose, cobwebby, to dense, tomentose, pale to medium ochraceous-brown, or pale to medium greyish brown. Mycelium partly immersed in the rust sori, but mostly superficial, composed of branched hyphae with integrated conidiogenous cells; distinction between conidiophores and vegetative hyphae difficult and barely possible. In vitro: Hyphae sub hyaline to pale olivaceous, pale brownish to olivaceous in mass, thin-walled, smooth, pluriseptate, occasionally slightly constricted at the septa. Conidiogenous cells integrated in creeping fertile threads, terminal or intercalary, subcylindrical to geniculate, sub hyaline to pale olivaceous, thin-walled, smooth, proliferation sympodial, with one to usually several conidiogenous loci per cell. Conidiogenous loci often crowded, causing slight swellings, up to 6 μm wide, sub denticulate, formed by the slightly bulging wall, convex, slightly narrowed towards the rounded apex, wall of the loci un thickened, not or slightly darkened-refractive, in surface view visible as a minute circle. Conidia solitary, obovoid, mostly prominently in equilateral (one side flattened or only slightly convex, the other convex), aseptate, sub hyaline, pale yellowish greenish to very pale olivaceous, wall, smooth, apex slightly attenuated to broadly rounded, base rounded to abruptly attenuated towards a more or less conspicuous hilum, convex to truncate, unthickened, not to slightly darkened refractive (adapted from Braun et al. 2011).

Type species: Pseudovirgaria hyperparasitica H.D. Shin, U. Braun, Arzanlou & Crous 2007

Notes: Pseudovirgaria is characterised by pale to medium brown mycelium which is composed of branched hyphae with integrated, terminal and intercalary conidiogenous cells. Pseudovirgaria is morphologically similar to Virgaria Nees, but differs in having hyaline to pale brown hyphae, conidia and conidiogenous cells. Pseudovirgaria was previously placed in Capnodiales, genera incertae sedis (Index Fungorum 2022; Wijayawardene et al. 2018). Hongsanan et al. (2020b) assigned Pseudovirgaria in Acrospermales, genera incertae sedis. The placement of Pseudovirgaria is still uncertain and requires more molecular data to resolve the systematic placement of the genus. Molecular markers available for Pseudovirgaria are ITS and LSU.


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