Clitocybe costata

Filamentous pileipellis formed by a dense layer of parallel hyphae with ochraceous intracellular pigment, slightly encrusted and with clamped septa.

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

Basidia cylindrical, slightly widened at the apex, 4-spored.

Spores ellipsoidal to amygdaliform, smooth, hyaline, thin-walled, with a prominent curved, hook-shaped lateral apiculus, inamyloid in Melzer's reagent.