Clitopilopsis albida S.P. Jian & Zhu L. Yang, sp. nov. 2020
MycoBank MB832734
Holotype: CHINA. YUNNAN PROVINCE: Deqin County, Baima Snow Mountain National Nature Reserve, scattered or in groups on alpine meadow with Carex and Polygonum), alt. 4421 m, 21 Aug 2018, S.P. Jian 224 (holotype KUN-HKAS104519).
Morphological description
Basidiomata clitocyboid, small. Pileus 10–30 mm wide, plano-convex to convex, often slightly depressed at center; surface dirty white (2A1) to pale cream (2A2), usually smooth or in pruinose; margin incurved to straight, often applanate or undulate in age; context thin, around 2 mm thick, grayish white (1A2). Lamellae decurrent, flesh-colored (5A4–5), somewhat crowded to slightly sparse, around 2 mm deep, edges entire and concolorous, very fragile, lamellulae mainly distributed on edges, nonattached to lamellae. Stipe 20–30 × 1–5 mm, central to eccentric, subcylindrical to applanate, subequal, hollow; surface flesh-colored (4B4) to ochraceous yellow (5B4–5), strongly gelatinized. Odor farinaceous or strongly farinaceous.
Basidiospores (6–)7–9.5 × (5.5–)6–8.5(–9) μm, Lm × Wm = 7.94 (± 0.76) × 7.10 (± 0.82) μm, Q = 1.00–1.29 (Qavg = 1.12 ± 0.07) [44/2/2], nearly hyaline, usually with thickened walls (0.3–0.8 μm), globose to subglobose and sometimes broadly ellipsoid in profile view, slightly angled in polar or face view with obscure minute pustules or bumps. Basidia 22–30 × 9–10 μm, clavate, hyaline, 4-spored, rarely 2-spored; sterigmata up to 7 μm long. Lamellar trama more or less regular, composed of hyaline hyphae, 3–15 μm wide; subhymenium composed of 4–5 layers of inflated or ovoid hyphal segments, these 5–12 × 3–8 μm wide. Lamellae edges fertile. Pleurocystidia 35–47 × 8–16 μm, abundant, clavate or branched with 2–6 septa. Cheilocystidia 37–64 × 8–19 μm, abundant, sometimes branched, clavate, with 2–4 septa. Pileipellis an ixocutis composed of more or less radially and loosely arranged, strongly gelatinized, hyaline, smooth, cylindrical hyphae, these 3–10 μm wide; subcutis made up of compactly arranged, thin-walled, hyaline, smooth, cylindrical hyphae, 3–12 μm wide. Stipitipellis an ixocutis composed of compactly arranged, strongly gelatinized, thin-walled, hyaline hyphae, 3–10 μm wide, with some slowly upturned terminal hyphae. Caulocystidia absent. Clamp connections absent.
Habitat: on alpine meadow with Carex and Polygonum).
Distribution: southwest China.
GenBank Accession: ITS MN061335; 28S MN065730; rpb2 MN148167; tef1 MN166278; atp6 MN133787
Notes: Clitopilopsis albida is also similar to Clp. heterospora (Murrill) Kluting et al. However, the latter differs from the former by the white pileus, smaller basidiospores, and the absence of pleurocystidia (Baroni 1981).
Reference: Si-Peng Jian, Tolgor Bau, Xue-Tai Zhu et al. (2020): Clitopilus,Clitocella, and Clitopilopsis in China.
Basidiomata of Clitopilus, Clitocella, and Clitopilopsis. A–C. Clitopilus umbilicatus (A. KUN-HKAS80370. B. KUN-HKAS104509. C. KUN-HKAS80310, holotype). D–E. Clitopilus yunnanensis (D. KUN-HKAS59712. E. KUN-HKAS82076). F. Clitocella mundula (HMJAU7275). G–H. Clitocella orientalis (G. KUN-HKAS78876. H. KUN-HKAS78763, holotype). I. Clitopilopsis albida (KUN-HKAS104519, holotype). Bars = 10 mm
