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

Luo, Xing-Xing, Liao, Ming-Gen, Hu, Ya-Fen, Zhang, Xiu-Guo, Xu, Zhao-Huan & Ma, Jian, 2025, Identification of three novel species and one new record of Kirschsteiniothelia (Kirschsteiniotheliaceae, Kirschsteiniotheliales) from Jiangxi, China, MycoKeys 112, pp. 277-306 : 277-306

publication ID	https://doi.org/10.3897/mycokeys.112.142028
DOI	https://doi.org/10.5281/zenodo.14727499
persistent identifier	https://treatment.plazi.org/id/720D2737-2DDF-5E9E-9C11-061DD25B64AD
treatment provided by	MycoKeys by Pensoft
scientific name	Kirschsteiniothelia jiangxiensis Y. F. Hu & Jian Ma
status	sp. nov.

Treatment

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

Fig. 4 View Figure 4

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 1273 , holotype), ex-type living culture, HJAUP C 1273 = HJAUP C 1274 = HJAUP C 1275 .

Etymology.

The name refers to the locality “ Jiangxi Province ”, from where the fungus was collected.

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, septate, dark brown to black, smooth-walled hyphae. Conidiophores macronematous, mononematous, simple or branched, erect, straight or flexuous, cylindrical, smooth, septate, dark brown to black, 32.9–90.4 × 7.3–12.9 μm (x ̄ = 48.7 × 9.1 μm, SD = 17 × 2, n = 15). Conidiogenous cells monoblastic, integrated, terminal, cylindrical, smooth, brown to dark brown, determinate, or sometimes with several cylindrical, enteroblastic percurrent extensions. Conidia solitary, acrogenous, obclavate, straight or curved, smooth, brown, 7–10 - euseptate, 75.9–103.8 × 8.9–15.2 μm (x ̄ = 90.8 × 10.9 μm, SD = 8 × 2, n = 20), tapering to 2.5–5.6 μm at the apex, 5.3–7.6 μm wide at the truncate base, and rounded at the apex. Sexual morph: Undetermined.

Culture characteristics.

Colonies growing on PDA medium reaching 85–90 mm diam. after 4 weeks at 25 ° C in darkness, irregular circular, surface velvety, grey-white in center and brown at margin with dense mycelium, reverse dark brown to black.

Note.

The phylogenetic tree showed that K. jiangxiensis ( HJAUP C 1273 , HJAUP C 1274 , and HJAUP C 1275 ) belongs to Kirschsteiniothelia and forms a distinct lineage sister to Clade 1. However, K. jiangxiensis ( HJAUP C 1273 ) differs from the morphologically most similar species, K. spatiosa ( MFLU 21-0128 ) ( Jayawardena et al. 2022), in having shorter conidiophores [32.9–90.4 μm (x ̄ = 48.7) vs. 70–128 µm (x ̄ = 100)] and smaller conidia [75.9–103.8 × 8.9–15.2 μm (x ̄ = 90.8 × 10.9 μm) vs. 90–139 μm × 9.5–16.5 µm (x ̄ = 113 × 14 μm)] with fewer septa (7–10 vs. 8–23), and further from K. spatiosa by 96 nucleotides (67 / 380 in ITS and 26 / 1032 in SSU). In addition, K. jiangxiensis also differs from other taxa in Clade 1 in the size of conidiophores and conidia.