Xylodon bambusinus C.L. Zhao & X. Ma, 2021

Ma, Xiang & Zhao, Chang-Lin, 2021, Xylodon bambusinus and X. xinpingensis spp. nov. (Hymenochaetales) from southern China, Phytotaxa 511 (3), pp. 231-247 : 242

Xylodon bambusinus C.L. Zhao & X. Ma , sp. nov. Figs. 4 , 5

MycoBank no.: MB 838334

Holotype:— CHINA. Yunnan Province, Wenshan, Xichou County, Xiaoqiaogou National Nature Reserve , E 104°41′, N 23°21′, alt. 1550 m, on dead bamboo, 16 January 2019, CLZhao 11310 ( SWFC!).

Etymology:— bambusinus (Lat.) : referring to the host of dead bamboo.

Basidiomata:—Annual, adnate, ceraceous, without odor or taste when fresh, becoming ceraceous to corneus upon drying, up to 6.5 cm long, 2.5 cm wide, 100–500 µm thick. Hymenial surface grandinoid, with 5–8 aculei per mm, aculei conical, acute, white to cream when fresh, turning cream to buff upon drying, cracking. Subiculum very thin, cream to buff. Margin sterile, 0.2 cm wide, cream.

Hyphal structure:—Hyphal system monomitic, generative hyphae with clamp connections, colorless, thickwalled, branched, interwoven, 2–6.5 µm in diameter, IKI-, CB-; tissues unchanged in KOH.

Hymenium:—Cystidia of two types, (i) fusiform cystidia smooth, colorless, thin-walled, 17.5–27 × 4–6 µm; (ii) capitate cystidia smooth, colorless, thin-walled, slightly constricted at the neck, with a globose head, 18.5–31 × 3–4 µm; basidia clavate to subclavate, constricted, with 4 sterigmata and a basal clamp connection, 15–28 × 3.5–4.5 µm.

Spore s:—Basidiospores broad ellipsoid, colorless, thin-walled, smooth, IKI-, CB-, (3.5–)4–5.5(–5.7) × (2.6–)3– 4(–4.4) µm, L = 4.34 µm, W = 3.26 µm, Q = 1.28–1.4 (n = 150/5). Holytype: (3.7–)4–5 × 2.6–3.7 µm, L = 4.29 µm, W = 3.22 µm, Q = 1.33 (n = 30/1).

Ecology and distribution:—Lignicolous, causing a white rot. Found in China.

Additional specimens (paratypes) examined:— CHINA, Yunnan Province, Wenshan, Xichou County, Xiaoqiaogou National Nature Reserve , E 104°41′, N 23°21′, alt. 1550 m, on dead bamboo, 16 January 2019, CLZhao 11211 ( SWFC!) , CLZhao 11215 ( SWFC!), CLZhao 11219 ( SWFC!), CLZhao 11224 ( SWFC!).

Figures

FIGURE 4. Basidiomata of Xylodon bambusinus (holotype). Bars:A—2 cm, B—1 mm.

FIGURE 5. Xylodon bambusinus (holotype), microscopic structures:A: Basidiospores. B: Basidia and basidioles. C: Capitate cystidia. D: Fusiform cystidia. E: A section of hymenium. F: A section of subiculum. Bars:A—5 µm; B–F—10 µm.