Micropsalliota globovelveta J.Q. Yan and Y.T. Liu, 2025

Liu, Yu-Tong, Ding, Ling, Zeng, Hui, Wang, Sheng-Nan & Yan, Jun-Qing, 2025, Micropsalliota globovelveta sp. nov., from subtropical regions of China, Phytotaxa 708 (3), pp. 269-280 : 275-276

Micropsalliota globovelveta J.Q. Yan and Y.T. Liu sp. nov. ( Fig. 2 )

MycoBank No: MB859276

Holotype:— CHINA. Fujian Province, Wuyishan National Park, 25 July 2022, Yu-Tong Liu, Sheng-Nan Wang , HFJAU3842 .

Diagnosis:— Micropsalliota globovelveta is mainly characterized by very small basidiomata; reddish white to greyish rose pileus, covered with very short velvety fibrils; basidiospores 5.5–6.0 × 3.0–3.5 μm; tibiiform cheilocystidia; and velvety fibrils on the pileus composed of abundant globose to ovoid and rarely short cylindrical cells, with pale brown vacuolar pigment. It differs from M. pruinosa by having tibiiform cheilocystidia and its velvety fibrils on the pileus composed of abundant spherical cells.

Etymology:— The name refers to the velvety fibrils on the pileus, which are composed of abundant globose cells.

Description:— Pileus 4.0–10.0 mm, reddish white to greyish rose (11A2–11B3), plano-convex to plane, surface dry, covered with very short velvety fibrils. Veil distributed along the margin of the cap, white, fibrillose, evanescent. Context thin. Lamellae 1.0–2.0 mm broad, short adnexed, distant, white, becoming brownish orange to brownish grey (7C2–7C3) when mature, edge white, smooth, with two series of lamellulae. Stipe 15–25 mm long, 0.5–0.8 mm thick, cylindrical, slender, white, surface with white short fibrils. Annulus single, membranous, superior to medium, white, easily falls off.

Basidiospores (5.2) 5.5–6.0 (6.4) × 3.0–3.5 (3.8) μm, 5.8 × 3.3 μm in average, Q= 1.6–1.9 μm, pale brown to nearly colorless, elongated-ellipsoid in face view, in profile flattened on one side or slightly phaseoliform, apically thickened endosporium indistinct, without germ pore, inamyloid. Basidia 12–17 × 5.0–6.7 μm, clavate, hyaline, 4- spored. Pleurocystidia absent. Cheilocystidia 21–40 × 4.7–11 μm, tibiiform, apex capitate, 3.0–5.0 μm in diameter. Velvety fibrils on the pileus composed of abundant globose to ovoid and rarely short cylindrical cells, 10–30 (35) μm broad, with pale brown vacuolar pigment.

Habit and habitat:— Scattered on the ground with moss in the broadleaf forest.

Specimens examined:— CHINA. Fujian Province, Wuyishan National Park, 20 July 2024, Jun-Qing Yan, Ling Ding, HFJAU3842.

Figures

FIGURE 2. Morphological structures of Micropsalliota globovelveta.A–C Basidiomata. D Spores E–H Cheilocystidia I–J Cells of fibrils on pileus. Scale bars A–C 10 mm; D–J 10 μm. Microstructures in D and F–I were observed in 5% KOH; E and J were observed in water; F–H were stained by 1% Congo red.