Hymenochaete dracaenicola 2021

Hymenochaete dracaenicola Z.B. Liu & Y.C. Dai, sp. nov.2021

MycoBank: 838683

Holotype：China. Hainan Province, Sanya, Daxiaodongtian Park, N18.299, E109.172, on dead tree of Dracaena cambodiana, 15.XI.2020, Dai 22090 (BJFC 035983).

Description:

Sexual morph：Fruiting body. Basidioma annual, resupinate, adnate, not separable from sub strate, hard corky, up to 7.5 cm long, 2 cm wide, and less than 0.1 mm thick at center. Hymenophore surface smooth or locally verruculose, clay buff, with some scattered crevices; margin cinnamon buff, up to 0.4 mm. Subiculum. Tomentum and cortex absent; hyphal layer present. Generative hy phae infrequent, hyaline, thick-walled, simple septate, often branched, 1–2 μm in diam. Skeletal hyphae cinnamon to orange brown, thick-walled to subsolid, rarely branched, interwoven, 1.5–2.5 μm in diam. Hymenium. Hyphae similar to those in hyphal layer. Setal layer present, thicken ing with age, with one to several rows of overlapping setae. Setae numerous, subulate with blunt to acute tips, orange brown to reddish brown, smooth, occasionally with a hyphal sheath, distinctly thick-walled, 30–57 × 6–10 μm, embedded or project ing up to 35 μm beyond the hymenium. Cystidia absent; cystidioles present, fusoid, hyaline, thin-walled, basally swollen, with a sharp or often hyphoid neck, 10–17 × 2.5–4 μm; Simple hyphidia present, scattered, thick-walled, 15–36 × 2–3.5 μm. Basidia subclavate to subcylindrical, with walls thickening toward the base, with four sterigmata and a basal simple septum, 17–23(–25) × 3.5–5 μm; basidioles similar to basidia but smaller. Spores. Basidiospores oblong ellipsoid with an apiculus, hyaline, thin-walled, smooth, IKI–, CB–, occasionally bearing a guttule, (5–)5.2–5.8(–6.1) × 2.5–2.8 μm, L = 5.6 μm, W = 2.68 μm, Q = 2.03–2.15 (n = 60/2).

Asexual.morph:Undetermined:

Hyphal structure：Hyphal system dimitic; generative hyphae infrequent, sim ple septate; skeletal hyphae dominant; tissues darkening but otherwise unchanged in KOH.

Culture: Undetermined:

Habitat: Undetermined:

Distribution:China

GenBank Accession: ITS MW559797，LSU MW559802；ITS MW559798，LSU MW559803；

Notes: Undetermined:

Reference: [1] Du, P. ,  Cao, T. X. ,   Wu, Y. D. ,  Zhou, M. , &  Liu, Z. B. . (2021). Two new species of hymenochaetaceae on dracaena cambodiana from tropical china. MycoKeys, 80(80), 1-17.

Scale bar: 1.0 cm. Photo by: Zhan-Bo Liu.

a basidiospores b basidia and basidioles c cystidioles d hyphidia e setae f Hyphae from hyphal layer. Drawings by: Meng Zhou.