Coltricia aridicola Y.C. Dai, Y.D. Wu & L.S. Bian

Wu, Ying-Da, Bian, Lu-Sen, Vlasák, Josef, Liu, Hong-Gao & Dai, Yu-Cheng, 2024, Coltricia aridicola sp. nov. derived from the Coltricia perennis complex (Hymenochaetaceae) confirmed by molecular phylogeny, Phytotaxa 642 (2), pp. 182-190 : 186-187

Coltricia aridicola Y.C. Dai, Y.D. Wu & L.S. Bian , sp. nov. Figs. 2 , 3

MycoBank number:—MB 847641.

Type:— CHINA. Yunnan Province, Ninlang County, Lugu Lake Nature Reserve , on ground of a Pinus yunnanensis forest after forest fire, elev., 3200 m, N27°31′27″, E100°44′22″, 9.IX.2021, Dai 23028 (holotype, BJFC037601 !).

Etymology:— aridicola (Lat.) : refers to the species growing in a dry environment.

Description:— Basidiocarps annual, centrally stipitate, solitary, coriaceous and without odor or taste when fresh, become soft corky, fragile or brittle when dry. Pilei more or less circular with slightly lobed margin, flat, thin, up to 6 cm diam and 3 mm thick at center. Pileal surface cinnamon to clay buff when fresh, hirsute in the center and velutinate in other parts, with distinct concentric zones; marginal zone darker than other zones, becoming grayish white when dry; margin acute, incurved when dry. Pore surface cinnamon buff to buff from center toward to margin, become fawn when dry, glancing; sterile margin distinct with two zones of buff and umber when fresh, becoming umber when dry; pores angular, 3–4 per mm; dissepiments thin, entire. Context umber and corky when dry, up to 0.2 mm thick. Tubes clay buff, distinctly paler than context, fragile or slightly brittle when dry, up to 2.8 mm long. Stipe cylindric, fuscous and coriaceous when fresh, becoming umber, corky, finely velutinate when dry, up to 4 cm long, 5 mm in diam.

Hyphal structure monomitic; generative hyphae simple septate; tissue darkening but otherwise unchanged in KOH. Contextual hyphae yellowish brown, thick-walled with a wide lumen, rarely branched, frequently simple septate, more or less straight, regularly arranged, 6–10 µm in diam; hyphae in stipe yellowish brown, thick-walled with a wide lumen, occasionally branched, frequently simple septate, more or less flexuous, loosely interwoven, 4–6 µm in diam; the antler-like hyphal elements present at pileal surface.

Tubes tramal hyphae hyaline to yellowish, thin- to slightly thick-walled with a wide lumen, rarely branched, usually simple-septate, flexuous, loosely interwoven to subparallel along the tubes, 3–4.5 µm diam. Cystidia and cystidioles absent, basidia clavate, thin-walled, with four sterigmata and a simple septum at the base, 22–25 × 6–8 µm; basidioles similar to basidia in shape, but slightly smaller.

Basidiospores oblong-ellipsoid, yellowish, thick-walled, smooth, IKI–, CB +, (6.8–)7–7.8(–8) × (4.2–)4.5–4.8(–5) µm, L = 7.12 µm, W = 4.64 µm, Q = 1.47–1.58 (n = 90/3).

Additional materials (paratypes) examined:— CHINA. Inner Mongolia, Hulun Buir, Honghuaerji Forest Park, on ground of Pinus sylvestris var. mongolica forest, elev. 700 m, N48°27′50″, E120°0′12″, 24.VII.2019, Dai 20115 ( BJFC 031789), Dai 20117 ( BJFC 031790), Dai 20121 ( BJFC 031793); Ningcheng County, Heili River Nature Reserve, on ground of Pinus tabuliformis forest, elev. 1100 m, N41°18′22″, E118°16′24″, 22.VIII.2006, Dai 16083 ( BJFC 020176). Yunnan Province, Binchuan County, Jizu Mt., on ground of Pinus armandii forest, elev. 2300 m, N25°57′38″, E100°23′40″, 13.IX.2017, Dai 18435 ( BJFC 025955), Dai 18436 ( BJFC 025956), Dai 18438 ( BJFC 025958); Lanping County, Changyan Nature Reserve, on ground of Pinus yunnanensis forest, elev., 3100 m, N26°22′17″, E99°26′52″, 18.IX.2011, Cui 10318 ( BJFC 011213), Cui 10319 ( BJFC 011214). Ninlang County, Lugu Lake Nature Reserve, on ground of Pinus yunnanensis forest after fire, 3200 m, N27°31′27″, E100°44′22″, 9.IX.2022, Dai 23027 ( BJFC 037600). USA. California, Prairie Creek Redwoods State Park, on the ground, VI.2006, JV2006/1- J ( JV).

Figures

FIGURE 2. Basidiocarps of Coltricia aridicola (Holotype, Dai 23028). Scale bar = 2.0 cm. Photo by Yu-Cheng Dai.

FIGURE 3. Microscopic structure of Coltricia aridicola (Holotype, Dai 23028). a. Basidiospores; b. Basidia and basidioles; c. the antlerlike hyphal elements from pileal surface. d. Contextual hyphae; e. Tramal hyphae. Drawings by Ya-Rong Wang