Distoseptispora ganzhouensis M. G. Liao & Jian Ma, 2025

Distoseptispora ganzhouensis M. G. Liao & Jian Ma sp. nov.

Fig. 4 View Figure 4

Type.

China • Jiangxi Province, Ganzhou City, Jiulianshan National Nature Reserve , 24°31'N, 114°27'E, on decaying wood of an unidentified broadleaf tree, 29 June 2022, Y. F. Hu (holotype HJAUP M 1090 ; ex-type living culture HJAUP C 1090 ) GoogleMaps .

Etymology.

In reference to the locality, Ganzhou city, where the fungus was collected.

Description.

Saprobic on dead branches in a terrestrial habitat. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Colonies on natural substratum effuse, hairy, and olivegreen to pale brown. Mycelium partly superficial, partly immersed in the substratum, composed of branched, septate, smooth, pale brown to brown hyphae. Conidiophores macronematous, mononematous, solitary, unbranched, straight or flexuous, smooth, 5–10 septate, cylindrical, brown to dark brown, paler towards the apex, determinate or sometimes with a cylindrical, enteroblastic percurrent extension, 54–93 × 4.5–7 µm, (x ̄ = 73.1 × 6.2 µm, n = 15). Conidiogenous cells monoblastic, integrated, terminal, cylindrical, pale brown to brown, smooth, flat at the conidiogenous loco. Conidia solitary, acrogenous, obclavate, straight or curved, pale brown to brown, 10–23 - distoseptate, smooth, 59–139 × 11.5–16.5 µm (x ̄ = 96.4 × 13.6 µm, n = 30), tapering to 4–8.5 µm near the apex, 3–6 µm wide at the truncate base.

Culture characteristics.

Colonies on PDA reaching 54 mm diam. after 4 weeks in an incubator under dark conditions at 25 ° C, circular, surface velvety, with dense and brown mycelium, dark brown to pale at the margin, reverse dark brown to black.

Notes.

Phylogenetic analyses shows that D. ganzhouensis ( HJAUP C 1090 ) clusters with D. sinensis Jing W. Liu, X. G. Zhang & Jian Ma ( HJAUP C 2044 ), with 100 % ML / 0.94 BI support. A BLASTn search of GenBank reveals that the sequences of D. ganzhouensis ( HJAUP C 1090 ) and D. sinensis ( HJAUP C 2044 ) share 98 % similarity (555 / 565, one gaps) in ITS, 99 % similarity (557 / 559, two gaps) in LSU, and 99 % similarity (925 / 930, no gaps) in TEF 1. Moreover, D. ganzhouensis is significantly different from D. sinensis ( Liu et al. 2023) by having longer conidiophores (54–93 µm vs. 23.5–56.5 µm) and wider conidia (11.5–16.5 µm vs. 10–12 µm).