Kirschsteiniothelia inthanonensis J. Louangphan & Gomes de Farias, 2024

Kirschsteiniothelia inthanonensis J. Louangphan & Gomes de Farias, 2024

Fig. 3 View Figure 3

Description.

Saprobic on decaying wood in terrestrial habitats. Asexual morph: Hyphomycetes. Colonies on natural substratum effuse, dark brown, hairy. Mycelium immersed and superfcial, composed of branched, septate, dark brown to black, smooth-walled hyphae. Conidiomata synnematous, solitary, erect, cylindrical, dark brown to black, becoming narrower toward the apex, up to 1266 μm high, 110–330 μm wide at the swollen base. Conidiophores distinct, macronematous, erect, straight or flexuous, closely fasciculate, branched near the apex, septate, smooth, cylindrical, brown to dark brown, up to 1266 μm long, 4.8–8 μm wide, diverging laterally and terminally. Conidiogenous cells monotretic, integrated, terminal, cylindrical, smooth, brown, determinate, or sometimes with several cylindrical, enteroblastic percurrent extensions. Conidia acrogenous, solitary or catenate, obclavate, straight or slightly curved, smooth, olivaceous brown to brown, 2–5 - euseptate, 20–48 × 8–13.3 μm (x ̄ = 31.4 × 9.8 μm, SD = 9 × 1, n = 30), partly tapering towards 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, circular, surface velvety, with reddish-brown to brown mycelium, reverse brown to dark brown.

Material examined.

China • Jiangxi Province, Ganzhou City, Longnan County, Jiulianshan Town, Guanshan National Nature Reserve , on dead branches of an unidentified broadleaf tree, 27 June 2021, Y. F. Hu ( HJAUP M 1502 , holotype), living culture, HJAUP C 1502 = HJAUP C 1503 .

Note.

Kirschsteiniothelia inthanonensis was originally described with an asexual morph on the twigs of Quercus oleoides in Thailand ( de Farias et al. 2024) and was known only from its type collection. Morphologically, our new collection shows high morphological similarity to K. inthanonensis except for its wider conidiophores (4.8–8 μm vs. 2.5–6.6 μm), shorter conidia (20–48 μm vs. 24–230 μm) with fewer septa (2–5 - euseptate vs. 2–10 - euseptate) ( de Farias et al. 2024). In addition, the phylogenetic tree showed that our new collection ( HJAUP C 1502 and HJAUP C 1503 ) clustered with K. inthanonensis ( MFLUCC 23-0277 ). Based on pairwise nucleotide comparisons of ITS, LSU, and SSU, their nucleotide differences (0 / 517 in ITS, 2 / 565 in LSU, and 0 / 1022 in SSU) are minor. Therefore, we identified our new collection as K. inthanonensis , and it is a new record for China.