Plectosphaerella cucumerina (Lindf.) W. Gams, in Domsch & Gams Figure 5

Description.

Colony on CMA after 3 d, hyphae hyaline, septate, smooth, thin-walled, branched, 2.5-3.5 μm (x̄ = 3.2 μm, n = 10) wide. Conidiophores macronematous, mononematous, erect or flexuous to sinuate, hyaline, smooth, branched, occasionally forming hyphal coils. Conidiogenous cells phialides, terminal, determinate, subulate. Conidia acrogenous, hyaline, unicellular, smooth-walled, oblong-ellipsoidal, 1-2 guttulate, 6.6-10.7 × 2.3-3.6 μm (x̄ = 8.7 × 3.1 µm, n = 30), forming hyaline to white mucilaginous masses. Sexual morph and chlamydospores absent.

Culture characteristics.

Colonies on OA reaching 55 mm diameter, on PDA reaching 48 mm diameter and on CMA reaching 44 mm diameter in 14 d at 25 °C. On PDA, colonies pale brown, repressed, flat, partly immersed, some aerial hyphae grew in the middle and margin of the medium, margin regular, reverse pale brown.

Strain examined.

China, Sichuan Province, Baiyu, 31°00'N, 99°41'E, 4013 m alt., isolated from Myriophyllum spicatum as an endophyte, 20 Aug. 2015, Z.F. Yu, YMF 1.04692.