Cortinarius jiaoheensis T. Bau & Y. Luo, 2021

Luo, Ying & Bau, Tolgor, 2021, Cortinarius jiaoheensis (Cortinariaceae), a new species of Cortinarius subgenus Telamonia section Flexipedes, from northeast China, Phytotaxa 494 (1), pp. 113-121 : 117-119

Cortinarius jiaoheensis T. Bau & Y. Luo sp. nov. ( Figs.2–4 )

MycoBank number:—MB838067

Diagnosis:—Basidiomata small. Pileus 6–12 mm diam, at first conical later almost plane with a prominent umbo, surface completely covered by woolly, whitish squamules. Lamellae emarginate, leather brown(6E6). Stipe slender, cylindrical, surface covered by white fibrils, greyish brown underneath, with rich white mycelium at the base. Universal veil white, forming zones on the stipe. Odor in context indistinct, not observed in lamellae. Taste somewhat spicy. Basidiospores 7.8–9.2 × 5.8–6.8 μm, broadly ellipsoid to somewhat obovoid ellipsoid, light brown (6D8) to rust brown (6E8), verrucose. Basidia with (2) 4 sterigmata. Lamellae margin with sterile cells.

Etymology:—‘jiaoheensis’ refers to its occurrence in Jiaohe County, Jilin Province, China.

Holotype:— CHINA. Jilin Province: Shansong ridge, Jiaohe County, Jilin City , 43°55′19″N, 127°05′17″E, elev. 483 m, Tolgor Bau , 3 September 2018 ( HMJAU56920 !).

Description:— Basidiomata small. Pileus 6–12 mm diam, conical when young, later almost applanate to applanate with a prominent umbo, margin undulating; margin initially incurved, then slightly applanate to sometimes upturned; surface greyish brown (5D3–5E3) but completely covered by woolly, greyish to whitish squamules making the overall appearance pale, squamules flattened to slightly erect, dense at centre, becoming sparser and extending to the edge of the pileus. Lamellae moderately broad, with three lamellulae, light brown (6D6) when young, later leather brown (6E6), margin uneven, L=23–28, I=1–3. Stipe 17–26 mm long, 1–2 mm thick, central, cylindrical and hollow, equal in width, fragile, greyish brown (5E3), surface covered with white fibrils, with copious white mycelium at the base. Universal veil white, forming zones on the stipe. Context thin, pale white (4A1) to yellowish grey (4B2), unchanging upon cutting. Odor in context indistinct, not observed in lamellae. Taste slightly spicy.

Basidiospores 7.8–9.2 × 5.8–6.8 μm (n=20), Q=1.23–1.50, Qav=1.37, broadly ellipsoid to somewhat obovoidellipsoid, light brown (6D8) to rust brown (6E8), verrucose. Basidia 24.3–29.2 × 9.7–11.7 μm, clavate, thin-walled, with two or four sterigmata, colorless to sometimes yellowish. Lamella margin with sterile cells, 19.5–27.3 × 7.8–9.8 μm, clavate, colorless. Pileipellis an epicutis of hyphae 6–13 μm wide, cylindrical, colorless to sometimes yellowish, some encrusted; hypoderm well developed, elements 15–25 μm wide, thin-walled, hyaline, subcellular; clamp connections present.

Habitat:—Scattered in broadleaved forests near Quercus mongolica , fruiting in autumn.

Known distribution:— Jilin Province, China.

Additional material examined:— CHINA. Jilin Province: Shansong ridge, Jiaohe County , Jilin City , 43°55′19″N, 127°05′17″E, elev. 483 m, Tolgor Bau, 3 September 2018, HMJAU56920 .

Figures

FIGURE 2. Cortinarius jiaoheensis (HMJAU56920, holotype!) Bars: A–C= 0.5 cm. Photos by Tolgor Bau.

FIGURE 3. Cortinarius jiaoheensis (HMJAU56920) a. Basidiomata; b. Basidiospores; c. Marginal cells; d. Basidia; e. Pileipellis. Bars: a = 1 cm; b–h =10 µm. Drawings by Ying Luo.

FIGURE 4. Scanning electron micrographs of Cortinarius jiaoheensis (from holotype, HMJAU56920) showing verrucose basidiospores. Photos by Ying Luo.