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

Yang, Xiao Qian, Ma, Shi Yun, Peng, Ze Xiang, Wang, Zhong Qiao, Qiao, Min & Yu, Zefen, 2021, Diversity of Plectosphaerella within aquatic plants from southwest China, with P. endophytica and P. sichuanensis spp. nov., MycoKeys 80, pp. 57-75 : 57

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.

Figures

Figure 5. Plectosphaerella cucumerina (YMF 1.04692) A-C colony on OA, PDA and CMA after 14 d D hyphal coils E, F conidiophores and Phialides G conidia. Scale bars: 1.35 cm (A-C), 10 µm (D-G).