Hyphoderma guangdongense J.Q. Su & C.L. Zhao

Su, Jiangqing, Zhang, Xunchi, Zhao, Changlin & Zhou, Hongmin, 2024, Molecular phylogeny and morphology reveal a new wood-inhabiting fungal species, Hyphoderma guangdongense (Polyporales, Basidiomycota), from China, Phytotaxa 661 (1), pp. 75-86 : 80

Hyphoderma guangdongense J.Q. Su & C.L. Zhao , sp. nov. Figs. 2 , 3

MycoBank no.: MB 852596

Diagnosis:— Differs from other species in the genus by the white hymenophore surface, a monomitic hyphal system, and cylindrical basidiospores (7.4–9.0 × 3.2–4.0 µm).

Etymology: — guangdongense (Lat.) : refers to “ Guangdong Province ” where the type specimen was collected.

Holotype: — CHINA. Guangdong Province, Shaoguan, Danxiashan National Forest Park, GPS coordinates: 24°56′ N, 113°41′ E, altitude: 415 m asl., on a fallen branch of angiosperm, leg. C.L. Zhao, 4 June 2019, CLZhao 12657 ( SWFC).

Gene sequences (from holotype):—PP235513 ( ITS) and PP235514 (nrLSU)

Basidiomata: — Annual, resupinate, farinaceous when fresh, turn brittle upon drying, without odor or taste, up to 10 cm long, 1 cm wide, 50–200 µm thick. Hymenial surface smooth, white when fresh, white upon drying. Sterile margin white, up to 1 mm.

Hyphal system: — Monomitic, generative hyphae with clamp connections, colorless, thick-walled, frequently branched, interwoven, 3.5–6.0 µm in diameter; IKI–, CB –, tissues unchanged in KOH.

Hymenium: — Cystidia of two types: (1) septate cystidia colorless, thick-walled, larger, presence of clamped septa with abundant encrustations, 93.0–144.0 × 8.0–10.4 µm; (2) tubular cystidia, colorless, thin-walled, 55.0–63.0 × 6.5–10.3 µm. Basidia barrelled, constricted, somewhat sinuous, with 4 sterigmata and a basal clamp connection, with oil drops, 15.5–18.0 × 5.5–7.0 µm; basidioles dominant, similar to basidia in shape, but slightly smaller.

Spores: — Basidiospores cylindrical, colorless, thin-walled, smooth, IKI–, CB –, (6.5–)7.4–9.0(–9.8) × (3.1–)3.2– 4.0(–4.6) µm, L = 8.19 µm, W = 3.63 µm, Q = 2.25 (n = 30/1), Q m =2.26 ± 0.20.

Type of rot: — White rot.

Ecology and distribution: — The sample collection site had a subtropical wet monsoon climate with an evergreen angiosperm forest, and samples were collected on fallen angiosperm branches. So far, it has only been found in Guangdong, China.

Figures

FIGURE 2. Hyphoderma guangdongense (holotype, CLZhao 12657): basidiomata on the substrate (A), macroscopic characteristics of hymenophore (B). Bars: (A) = 2 cm and (B) = 2 mm.

FIGURE 3. Microscopic structures of Hyphoderma guangdongense (holotype, CLZhao 12657): basidiospores (A), basidia and basidioles (B), tubular cystidia (C), septate cystidia (D), a section of the hymenium (E). Bars: (A–C) = 5 µm; (D–E) = 10 µm.