Kirschsteiniothelia ganzhouensis Y. F. Hu & Jian Ma, 2025

Kirschsteiniothelia ganzhouensis Y. F. Hu & Jian Ma sp. nov.

Fig. 2 View Figure 2

Type.

China • Jiangxi Province, Ganzhou City, Longnan County, Jiulianshan National Nature Reserve , on dead branches of an unidentified broadleaf tree, 29 June 2022, Y. F. Hu ( HJAUP M 1209 , holotype), ex-type living culture, HJAUP C 1209 = HJAUP C 1210 = HJAUP C 1211 .

Etymology.

The name refers to the type locality “ Ganzhou City ”.

Description.

Saprobic on decaying wood in terrestrial habitats. Asexual morph: Hyphomycetes. Colonies on natural substratum effuse, dark brown, hairy. Mycelium superficial and immersed, composed of branched, dark brown to black, septate, smooth-walled hyphae. Conidiophores macronematous, mononematous, erect, straight or flexuous, irregular or subscorpioid branched near the apex, cylindrical, smooth, septate, dark brown to black, 146.8–200 × 7.1–10.1 μm (x ̄ = 176.1 × 8.0 μm, SD = 21 × 1, n = 15). Conidiogenous cells monotretic, integrated, terminal or intercalary, cylindrical, pale brown to brown, determinate, or sometimes with several cylindrical, enteroblastic percurrent extensions. Conidia acrogenous, solitary, obclavate, straight or slightly curved, sometimes rostrate, smooth, subhyaline to pale brown, 2–7 (– 14) - distoseptate, 20.3–65.8 (– 164) × 3.0–5.3 μm (x ̄ = 36.4 × 4.7 μm, SD = 12 × 0.36, n = 20), tapering to 1.3–2.6 μm near the apex, 3.0–5.3 μm wide at the base, and rounded at the apex. Sexual morph: Undetermined.

Culture characteristics.

Colonies growing on PDA medium reaching 30–35 mm diam. after 4 weeks at 25 ° C in darkness, irregular circular, surface yellow-brown with fluffy hyphae, reverse dark brown to black.

Note.

The phylogenetic tree showed that K. ganzhouensis ( HJAUP C 1209 , HJAUP C 1210 , and HJAUP C 1211 ) clusters with K. fluminicola ( MFLUCC 16-1263 ). Based on the BLASTn results, ITS and LSU gene sequences of K. ganzhouensis ( HJAUP C 1209 ) showed 93 % (484 / 520, 3 gaps) and 99 % (518 / 525, 0 gap) similarities to K. fluminicola ( MFLUCC 16-1263 ), respectively. Moreover, K. ganzhouensis differs morphologically from K. fluminicola Z. L. Luo, K. D. Hyde & H. Y. Su ( Bao et al. 2018) in having monotretic conidiogenous cells, shorter conidiophores (146.8–200 μm vs. 209–286 μm), and smaller conidia (20.3–65.8 × 3.0–5.3 μm vs. 47.5–86.5 × 8–10 μm). In addition, K. ganzhouensis further differs from K. fluminicola in that it occurs in a terrestrial habitat and not in a freshwater habitat.