Sebacina aciculicola J. H. Dong, X. Zhang, Y. C. Dai & F. Wu, 2025

Dong, Jia-Hui, Zhang, Xin, Guan, Qian-Xin & Wu, Fang, 2025, Morphological characteristics and phylogenetic analysis reveal Helvellosebacina filicata sp. nov. and Sebacina aciculicola sp. nov. in Sebacinales from southwest China, MycoKeys 118, pp. 105-118 : 105-118

Sebacina aciculicola J. H. Dong, X. Zhang, Y. C. Dai & F. Wu sp. nov.

Figs 5 , 6 , 7

Holotype.

China • Guizhou Province, Guiyang, Qianlingshan Park , 21 August 2023, bark of Pinus massoniana, Dai 25793 (holotype, BJFC 043342 ).

Etymology.

Aciculicola (Lat.): refers to the species growing on needles and bark of Pinus massoniana .

Description.

Basidiomata. Annual, resupinate, closely adnate on substrate, widely effused, not easily separable, coriaceous, white to cream when fresh, up to 15 cm diam and 0.1 cm thick, color and structure almost unchanged when dry; margin gradually thinning out, concolorous with the center.

Hyphal structure. Hyphal system monomitic; hyphae simple or branched, sometimes flexuous, hyaline, thin-walled or thick-walled, smooth, without clamp connections, 2.0–5.0 µm diam., embedded in hymenium and subhymenium.

Hymenium. Cystidia absent; hyphidia (dikaryophyses) present, unbranched, with several simple septa, usually derived from the same hyphae with probasidia; probasidia pyriform to subglobose; mature basidia thin-walled, obovate to subglobose, stalked, 16–22.8 × 11–14 µm, longitudinally septate, 4 - celled, usually with oil drops; sterigmata up to 62.0 μm long, 2.0–3.5 μm diam., with tapered apex.

Basidiospores. Hyaline, thin-walled, smooth, broadly ellipsoid to ovoid, apiculate, usually with several large oil drops, (9.3 –) 10.2–12.9 (– 13.7) × (6.2 –) 6.3–8.7 (– 9.1) µm, L = 10.9 µm, W = 7.4 µm, Q = 1.47 (n = 40 / 1), germinating by germination tubes.

Figures

Figure 5. Basidiomata of Sebacina aciculicola (holotype, Dai 25793).

Figure 6. Photos of microscopic structures of Sebacina aciculicola (holotype, Dai 25793) a, b basidia c hyphae d basidiospores. Scale bars: 10 μm (a – c); 5 μm (d).

Figure 7. Drawings of microscopic structures of Sebacina aciculicola (holotype, Dai 25793) a basidiospores b basidia c hyphae. Scale bars: 5 μm (a, c); 10 μm (b).