Mycena umbratilis Maas Geest. & de Meijer

Original diagnosis
Basidiomata dispersa. Pileus usque ad 2.5 mm latus, convexus, siccus, subsulcatus, striatus, griseoalbus. Caro tenuis, alba, odore nullo. Lamellae c. 10 stipitem attingentes, molles, adscendentes, ventricosae, c. 0.3 mm latae, anguste adnatae, albae, margine convexae, concolores. Stipes —18 x 0.2 mm, fistulosus, fragilis, aequalis, cylindraceus, siccus, levis, totus puberulus, albus, basi subbulbosus. Basidia (immatura) 7—8 pm lata, late clavata, 4-sporigera. Sporae 8.5—10.3 x 3.6-5.4 pm, inaequilateraliter ellipsoideae, leves, amyloideae. Cheilocystidia 9-10 um lata, fusiformia, surculis cylindra ceis 0.9-1.5 x 0.5 Jim instructa, Pleurocystidia nulla. Trama lamellarum iodi ope brunneovinescens. Hyphae pileipellis 2.5-4.5 pm latae, efibulatae, spinulosae. Acanthocystides 11-17 x 11-16 pm, globosae, minute denseque spinulosae. Cherocytes haud visae. Hyphae stipitis corticales 1.8-3.5 Lum latae, leves. Caulocystidia —120 x 3-8 pm, cylindracea, dense spinulosa. Cystidia stipitis basi c. 20 x 9 Jm, efibulata, dense spinulosa. Foliicola.