Tricholoma lascivum

A species typical of broadleaf trees, such as beech or oak, on calcareous soils, with a convex to flattened pileus, 3 to 7.5 cm in diameter, smooth whitish to ochraceous surface, adnate whitish lamellae that develop rust-like spots with age, cylindrical cream-colored stipe, unpleasant gas-like odor, and bitter to acrid taste upon mastication.

Cuticle filamentous, composed of cylindrical hyphae, hyaline or with faint yellowish pigment inside, interwoven, upper hyphae 3 to 9 µm wide, and broader hyphae beneath up to 15 µm or more wide, all septate with simple septa (without clamp connections).

Without cystidia.

Lamellar trama regular or parallel.

Basidia clavate, 25 to 35 µm long, 5.5 to 8 µm wide, with simple base, 4-spored.

Spores ellipsoid with one side flatter, smooth, hyaline, thin-walled, 6.5 to 8.5 µm long, 4 to 5 µm wide, with an eccentric apiculus at one end, containing one or several oil droplets (guttules) inside, inamyloid in Melzer's reagent.

Herbarium material available: JTP2631/25.