Lepiota sinorecondita ad interim

Vizzini, Alfredo, Tatti, Alessia, Huijser, Henk A., Liang, Jun F. & Ercole, Enrico, 2019, Looking for Lepiotapsalion Huijser & Vellinga (Agaricales, Agaricaceae), MycoKeys 52, pp. 45-69 : 45

Lepiota sinorecondita ad interim Fig. 10

Description.

The specific epithet is a combination of Medieval Latin “sino” (which means Chinese) and " recondita ", referring to the strong affinity of the Chinese taxon to the European L. recondita .

Basidiomata small (Fig. 10a). Pileus 9-17 mm wide, expanding to convex with obtuse umbo; at centre on umbo smooth, dark yellowish brown to dark brown, around umbo split up into pale brown concentrically arranged patches on dirty white to cream background, paler and smaller towards margin. Stipe 35-37 × 1-4 mm, subcylindrical or attenuate, slightly inflated at base; hollow, dirty white and glabrous at the apical part, surface whitish, covered white, tomentose at lower part, with white mycelial cords at base; annulus membranous, superior, whitish on upper surface, with small yellowish brown to brownish squamules on lower whitish surface. Lamellae free, cream, yellow to brown when dry, crowded with lamellulae, edge wavy.

Spores [60,3,1] (4.0 –)4.5– 5.5 × 2.5 –3.0(– 3.5) µm, Q = 1.50 –1.80(– 1.83), Qav = 1.64 (Fig. 10b), ellipsoid to oblong in side and front view, without suprahilar depression, sometimes with straight adaxial side; hyaline, smooth, non-dextrinoid, congophilous but very weakly, slightly reddish purple in Cresyl Blue. Basidia 17-22 × 5-6 μm, narrowly clavate or subcylindrical, 4-spored. Lamella edge sterile. Cheilocystidia 21-40 × 6-13 μm, clavate to narrowly clavate, rarely broadly clavate, colourless, hyaline, thin-walled (Fig. 10c). Pleurocystidia absent. Pileus covering a hymeniderm made up of broadly clavate, clavate to obpyriform terminal elements, 18-50 × 10-20 μm, with pale yellowish brown intracellular pigment (Fig. 10d). Clamp-connections present in all tissues.

Collection examined.

China, Jilin Province, Changchun City, Jinyuetan Park, 7 July 2005, Wang Jianrui (HMJAU 3799).

Ecology and distribution.

Solitary, terrestrial, on the ground in a larch forest in summer and autumn. So far known only from China.