Helvellosebacina chrysallidodoma H. Suh, D. Kim & Y. W. Lim 2026, sp. nov.

Helvellosebacina chrysallidodoma H. Suh, D. Kim & Y. W. Lim sp. nov. Fig. 3 Diagnosis. Basidiomata grow on small shrubs, forming a pupal shelter-like structure covering the entire trunk. Holotype. REPUBLIC OF KOREA, Gyeonggi-do, Gapyeong-gun, Mt. Yumyeong Natural Recreation Forest, on a shrub stem, 06 October 2023, SFC 20231006-06 (dried specimen). Etymology. From chrysallidis – pupa and doma – house in Latin, referring to the resemblance of the basidiomata that surround a trunk like a pupal shelter. Description. Basidiomata fully resupinate, attached firmly to the shrub stems, forming thick wax-like patches covering the whole substrate, spanning several centimeters. Surface smooth, dull, white (1 A 1), consistency wax-like, cartilaginous. Margin irregularly thinning out, distinctly bounded, concolorous with hymenophore surface. Basal hyphal system monomitic, subicular hyphae average 0.5 μm thick, septate with frequent branching, hyaline, without clamp connections, 2.8–4.2 μm thick. Basidiospores elliptical or allantoid, hyaline, smooth, IKI-, CB-, (8.0 –) 8.6–13.6 (– 14.7) × (6.1 –) 6.6–9.3 (– 10.3) μm with granular contents (L = 10.8 μm, W = 7.7 μm, Q = 1.4, n = 35 / 2). Dikaryophyses simple-structured, sparingly ramified, derived from the same hyphae with basidia. Probasidia elliptical to subglobose or pyriform, mature basidia globose to subglobose, longitudinally septate, 14.4–18.2 × 11.4–13.1 μm, usually containing oil drops with four elongated sterigmata, average 2.5 μm width, up to 22 μm long, blunt at the apex. Cystidia absent. Distribution. REPUBLIC OF KOREA. Additional specimen examined. REPUBLIC OF KOREA, Gangwon State, Yanggu-gun, Yanggu-eup, Yanggu Arboretum, on a litter, 08 September 2023, SFC 20230908-01. Notes. Helvellosebacina chrysallidodoma can be distinguished from other Helvellosebacina species by its growth habit of covering the entire plant stem and lacking the paler or thinning margin typical of related species. GenBank accession numbers. ITS (PV 399946, PV 399956), LSU (PV 399908, PV 399918), rpb 2 (PV 417267 – PV 417268).