Helvellosebacina filicata 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

Helvellosebacina filicata J. H. Dong, X. Zhang, Y. C. Dai & F. Wu sp. nov.

Figs 2 , 3 , 4

Holotype.

China • Yunnan Province, Puer, Puer Forest Park , 17 August 2019, on living ferns, Dai 20449 (holotype, BJFC 032117 ).

Etymology.

Filicata (Lat.): refers to the species growing on living ferns.

Description.

Basidiomata. Annual, resupinate, amorphous, closely adnate on substrate, widely effused, easily separable, cartilaginous to gelatinous, white to cream, sometimes semi-transparent when fresh, up to 12 cm diam and 0.05 cm thick, distinctly shrinking to a film and becoming fawn to clay-buff when dry.

Hyphal structure. Hyphal system monomitic; hyphae simple or branched, sometimes flexuous, hyaline, thin-walled or thick-walled, without clamp connections, 2.6–3.8 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, 12–16.8 × 9.8–13.7 μm, longitudinally septate, 4 - celled, usually with oil drops; sterigmata up to 52.7 μm long, 1.4–2.7 μm diam., with tapered apex.

Basidiospores. Hyaline, thin-walled, smooth, broadly ellipsoid to ovoid, apiculate, usually with several large oil drops, (7.9 –) 8.6–9.9 (– 11.1) × (5.1 –) 5.8–7.6 (– 8.3) μm, L = 9.2 μm, W = 6.8 μm, Q = 1.35 (n = 40 / 1).

Figures

Figure 2. Basidiomata of Helvellosebacina filicata (holotype, Dai 20449).

Figure 3. Photos of microscopic structures of Helvellosebacina filicata (holotype, Dai 20449) a, b basidia c hyphae d basidiospores. Scale bars: 10 μm (a – c); 5 μm (d).

Figure 4. Drawings of microscopic structures of Helvellosebacina filicata (holotype, Dai 20449) a basidiospores b basidia c hyphae. Scale bars: 5 μm (a, c); 10 μm (b).