Pseudovirgaria hyperparasitica
Pseudovirgaria hyperparasitica H.D. Shin, U. Braun, Arzanlou & Crous, in Arzanlou et al., Stud. Mycol. 58: 87 (2007).
Index Fungorum number: IF 504565; Facesoffungi number: FoF 11852, Fig. 1, 2
Description:
Saprobic or pathogenic on host. Sexual morph: Unknown. Asexual morph: Colonies 20–50 × 15–40 µm (x̄ = 22.5 × 20.1 μm, n = 10), on leaves, thin to moderately thick, loose, cobwebby, to dense, tomentose, pale to medium brown, rusty or cinnamon. Mycelium partly immersed on leaves, but mostly superficial, composed of a system of branched hyphae with integrated conidiogenous cells, difference between conidiophores and vegetative hyphae difficult and hardly possible. Hyphae 1.0–3 µm wide, hyaline, sub hyaline to pale yellowish, greenish or very pale olivaceous, light brownish in mass, thin-walled, smooth, pluriseptate, sometimes slightly constricted at the septa. Conidiogenous cells 10–40 µm long, 2–4 µm wide, integrated, terminal or intercalary, subcylindrical to geniculate, subhyaline to very pale brownish, wall thin, smooth, proliferation sympodial, with a single to generally numerous conidiogenous loci per cell, frequently crowded, producing slight swellings, up to 5–6 µm wide, subdenticulate loci, formed by the somewhat bulging wall, convex, slightly narrowed towards the rounded apex, wall of the loci unthickened, not or somewhat darkened-refractive, in surface view visible as tiny circle. Conidia 10–25 × 5–9 µm (x̄ = 11.2 × 6.3 μm, n = 15), hyaline to subhyaline, aseptate, ovoid, regularly somewhat curved, with truncate base and acutely rounded apex; hila unthickened, slightly darkened refractive
Material examined: South Korea, Chunchon, on Pucciniastrum agrimoniae (Pucciniastraceae), on Agrimonia pilosa (Rosaceae), 7 Oct 2002, H. D. Shin (HAL 2054F, holotype).
Fig. 1 Pseudovirgaria hyperparasitica (HAL 2054F, holotype). a–c Herbarium specimen and habit on leaf. d Conidiogenous cells with geniculate proliferation. e–n Conidia. Scale bars: d = 20 μm, e–n = 10 μm.
Fig. 2 Pseudovirgaria hyperparasitica (CBS 121739 = CPC 10753, redrawn from Arzanlou et al. 2007). a Conidia. b Conidiophores with conidiogenous cells. Scale bar = 10 µm.
Importance and distribution
Pseudovirgaria comprises two species. Pseudovirgaria grisea is reported on uredinia of Phragmidium, on leaves of Rubus caesius and R. fruticosus (Rosaceae) while P. hyperparasitica has been reported from Pucciniastrum agrimoniae (Pucciniastraceae) on Agrimonia pilosa (Rosaceae). Pseudovirgaria is reported from Asia (South Korea) and Europe (Italy).
References
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