Mycena alcalina

Lignicolous species growing caespitosely on coniferous wood, with a conical to campanulate pileus 1–2.5 cm across, dark brown, adnate lamellae, a cylindrical, hollow sepia-brown stipe, and a nitrous odour.

Cuticle (pileipellis) with filamentous hyphae 2–5 µm wide, separated by gelification, with scattered cylindrical excrescences, septate and clamped.

Cheilocystidia fusiform, subcylindrical to lageniform, measuring 35–65 µm long by 8–14 µm wide.

Pleurocystidia absent.

Basidia clavate, 25–35 µm long by 7–9 µm wide, with basal clamps, 4-spored.

Spores ellipsoidal to oblong, smooth, hyaline, thin-walled, with a slightly pointed end where the apiculus is located, measuring 10–12 µm long by 5.5–6.8 µm wide, containing guttules inside, amyloid in Melzer's reagent.