Cortinarius casimirii

Pileipellis composed of two well-differentiated layers: an upper thin layer of narrow, parallel, heavily pigmented hyphae with clamped septa, and underneath a thicker layer of hyaline, parallel, much broader hyphae with short cells, even subglobose.

Lamellar edge homomorphic, without differentiated elements from basidia or basidioles.

Basidia clavate, up to 40 µm long, 4-spored.

Spores ellipsoidal to amygdaliform, yellowish-brown under the microscope, with an inconspicuous eccentric apiculus and hilar depression, moderately to strongly verrucose, with a marked dextrinoid reaction in Melzer's reagent.