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

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

Fig. 5 View Figure 5

Type.

China • Fujian Province, Nanping City, Wuyishan National Nature Reserve , 27°43′N, 117°41′E, on decaying wood of an unidentified broadleaf tree, 16 October 2023, Y. F. Hu (holotype HJAUP M 2517 ; ex-type living culture HJAUP C 2517 ) GoogleMaps .

Etymology.

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

Description.

Saprobic on dead branches in a terrestrial habitat. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Colonies on natural substrate effuse, scattered, dark brown to black, hairy. Mycelium partly superficial, partly immersed in the substratum, composed of branched, septate, smooth, pale brown to brown hyphae. Conidiophores macronematous, mononematous, unbranched, solitary, straight or slightly flexuous, cylindrical, smooth, 1–3 - septate, brown to dark brown, 8.5–28 × 5–7 µm (x ̄ = 18.1 × 6.1 µm, n = 10). Conidiogenous cells monoblastic, integrated, terminal, determinate, cylindrical, flat at the conidiogenous loco. Conidia solitary, acrogenous, dry, obclavate, straight or curved, sometimes with a swollen cell, reddish-brown and slightly paler towards the apex, 28–41 - distoseptate, sometimes constricted at the septa, smooth, sometimes with percurrent regeneration forming a secondary conidium from the conidial apex, 169–282 × 12–17.5 µm (x ̄ = 227.1 × 14.8 µm, n = 20), tapering to 5–9 µm near the apex, 3.5–5.5 µm wide at the truncate base.

Culture characteristics.

Colonies on PDA reaching 67–71 mm diam. after 4 weeks in an incubator under dark conditions at 25 ° C, irregularly circular, surface velvety with white to pale brown and denser mycelium, becoming black at the margin, reverse black.

Notes.

Phylogenetic analyses shows that D. nanpingensis ( HJAUP C 2517 ) forms a distinct clade, sister to the clade containing D. guanshanensis Y. F. Hu & Jian Ma ( HJAUP C 1063 ) and D. longnanensis Y. F. Hu & Jian Ma ( HJAUP C 1040 ), with 92 % ML / 1.00 BI support. A BLASTn search of GenBank reveals that the sequences of D. nanpingensis ( HJAUP C 2517 ) and D. guanshanensis ( HJAUP C 1063 ) share 99 % similarity (602 / 608, no gaps) in ITS, 99 % similarity (546 / 547, no gaps) in LSU, 98 % similarity (906 / 923, four gaps) in RPB 2, and 98 % similarity (906 / 927, no gaps) in TEF 1. The sequences of D. longnanensis ( HJAUP C 1040 ) share 98 % similarity (608 / 621, five gaps) in ITS, 99 % similarity (560 / 565, two gaps) in LSU, and 98 % similarity (903 / 923, no gaps) in TEF 1. Moreover, D. nanpingensis is significantly different from D. guanshanensis ( Hu et al. 2023) by having shorter conidiophores (8.5–28 µm vs. 15.4–44.7 µm), and longer conidia (169–282 µm vs. 96.5–255.3 μm) sometimes with percurrent regeneration forming a secondary conidium from the conidial apex. Distoseptispora nanpingensis also differs from D. longnanensis ( Hu et al. 2023) by having shorter conidiophores (8.5–28 µm vs. 77–171 μm) and larger conidia (169–282 × 12–17.5 µm vs. 54–87 × 8.2–14 μm) with more distosepta (28–41 vs. 4–8).