黄鳞囊小伞

3.2.3 Cystolepiota luteosquamulosa T. Bau and X. Y. Zhou, sp. nov.
MycoBank number: MB 849380 (Figures 7, 8).
Diagnosis: C. luteosquamulosa is distinguished from other Cystolepiota species by its light yellow to greyish yellow pileus, with greyish yellow to dark yellow warty to subpyramidal squamules, light reddish brown stipe with white to light yellow floccose squamules, and pleurocystidia and cheilocystidia absent.
Etymology: “luteo-” means yellow, and “luteosquamulosa” refers to the yellow squamules on the pileus.
Type: China, Jilin province, Jiaohe City, Hongyegu, September 6, 2021, coll. T. Bau and X. Wang (HMJAU67711), Holotype!
Description: Basidiomata small. Pileus 0.8–1.4 cm, hemispherical to obtusely conical when young, expanding to plano-convex or applanate with a slightly umbonate center with age, light yellow (1A4–A8) to greyish yellow (2B5–B8), with greyish yellow (2C7–C8) to dark yellow (3C5–C8) warty to subpyramidal squamules; margin appendiculate with veil remnants when young, and then finely appendiculate, concolorous with pileus; context white, thin. Lamellae free, white to cream, crowded, 0.1–0.3 cm wide, with 1–3 tiers of lamellulae, drying brownish orange (5C2–C6). Stipe 2.5–5.6 × 0.1–0.2 cm, subcylindrical, light reddish brown (7E5–E8), with some floccose squamules, white to light yellow (1A2–A8), with conspicuous white mycelia on the base. Annulus not visible. Odor and taste not recorded (Figures 7A–C, 8A).
Basidiospores [120,4,4] 4.9–6.3 (−6.6) × (−2.0) 2.4–3.0 (−3.3) μm, Q = 1.70–2.63, Qv = 2.10, long ellipsoid to cylindrical, hyaline, smooth-walled under the LM, finely punctate under SEM, inamyloid, non-dextrinoid, metachromatic in cresyl blue, cyanophilous. Basidia 15–23 × 4–7 μm, clavate, 4-spored, sometimes 2-spored. Lamellar trama regular. Pleurocystidia and cheilocystidia absent. Squamules composed of loosely-arranged globose, subglobose, ovoid, 13–62 μm in diam., rarely gourd-shaped or fusiform, 17–42 × 7–16 μm, sometimes 2–4 cells are connected in a string, smooth-walled, slightly thick-walled, hyaline, or orange white (5A2–A3). Clamp connections present in all structures (Figures 7D–F, 8B–D).
Habitat: Solitary or scattered on dead leaves or soil of mixed forest.
Distribution: Northeastern China.
Additional specimens examined: China, Jilin Province, Jiaohe City, Qianjin forest farm, July 24, 2022, coll. T. Bau and L. Y. Zhu (HMJAU67810); Dunhua City, State Forest farm, July 27, 2022, coll. T. Bau, W. N. Hou and F. Guo (HMJAU67808, HMJAU69060); Huadian City, Red Rock National Forest Park, August 28, 2023, coll. T. Bau and H. Cheng (HMJAU67807). Heilongjiang Province, Yichun City, Xing’an National Forest Park, July 25, 2023, coll. T. Bau and W. N. Hou (HMJAU67809).
Notes: Macromorphologically, both C. luteosquamulosa and C. luteohemisphaerica have yellow pileus. But in the latter, the pileus is radially veined and micaceous-mealy, with broadly elliptical to elliptical basidiospores (Saar and Laessoe, 2008). C. icterina also has a yellow pileus, but it is easy to distinguish from C. lutesquamulosa by its pileus surface with finely floccose-farinose squamules, by its smaller (3.5–4.5 × 2.5 μm) and dextrinoid basidiospores and by the presence of cheilocystidia (Knudsen, 1978).