Calonarius rufo-olivaceus

Cutis formed by filamentous hyphae, rather narrow (up to 5 µm), densely interwoven, with abundant greenish-brown intracellular pigment, widely separated by gelatinization, and with clamped septa.

Lamellar edge with abundant clavate sterile elements, similar in morphology to basidioles but smaller.

Basidia cylindrical to slightly clavate, up to 45 µm long, 4-spored.

Spores citriform, ornamented with coarse warts, with an apiculus at one end, significantly darkening in KOH, and with a slight dextrinoid reaction in Melzer's reagent.