1. Pileus coloured white to creem or whitish grey
    1. Growing on fallen, decaying leaves
      1. Growing on leaves of Quercus
        1. With a small basal disc: Mycena mucor
        2. Devoid of a basal disc: Mycena poyadelpha
      2. Growing on leaves of Fagus
        1. Mycena capillaris
      3. Growing on fallen leaves of Salix
        1. Mycena terena
    2. Growing on (moss covered) bark of deciduous trees
      1. Lamellae ascending
        1. Hyphae of the pileipellis smooth: Mycena olida
        2. Hyphae of the pileipellis diverticulate: Mycena hiemalis
      2. Lamellae horizontal to arcuate
        1. Spores almost globose: Mycena alba
        2. Spores pip-shaped: Mycena speirea (white form)
    3. Growing on the leaf sheaths deep down in clumps of Juncus: Mycena oligophylla
    4. Growing elsewhere
      1. Lamellae less than 15 reaching stipe
        1. Pileus densely white-furfuraceous to granular-floccose: Mycena adscendens
        2. Pileus pruinose to glabrous, mostly with brownish shades: Mycena mirata
      2. Lamellae more than 15 reaching stipe
        1. On decaying wood and stumps of conifers: Mycena laevigata
        2. Terrestrial
          1. Densely gregarious; with age stained with red-brown spots: Mycena zephirus
          2. Gregarious; pileus pale yellowish to ochraceous at the centre: Mycena flavoalba
  1. Pileus differently coloured
    1. Growing on wood
      1. On coniferous wood
        1. Growing exclusively on Juniperus: Mycena juniperina
        2. Growing on other trees
          1. Lamellar edge distinctly coloured
            1. Lamellar edge reddish brown: Mycena rubromarginata
            2. Lamellar edge dark violet: Mycena purpureofusca
            3. Lamellar edge olive green or brownish: Mycena viridimarginata
          2. Lamellar edge concolorous with lamellar face
            1. Pileus less than 6 mm across
              1. Cheilocystidia lageniform to subcylindrical, smooth or somewhat branched: Mycena clavata
              2. Cheilocystidia clavate, densely covered with "warts": Mycena mirata
            2. Pileus more than 6 mm across
              1. Odeur nitrous
                1. Vernal, occuring in may - june; 2-spored: Mycena silvae-nigrae
                2. Occuring in autumn; 4-spored: Mycena stipata
              2. Odeur indistinctive
                1. Fasciculate, with age stained with reddish brown spots: Mycena maculata
      2. On wood of deciduous trees
        1. Fairly small species; growing on (mostly moss-covered) bark
          1. Lamellae horizontal to arcuate
            1. Spores globose
              1. Pileus bluish, at least when young: Mycena pseudocorticola
              2. Pileus brownish lilac to dingy reddish brown: Mycena meliigena
              3. Pileus sepia brown: Mycena supina
              4. Pileus dingy white to cream, sometimes pale brown: Mycena alba
            2. Spores pip-shaped
              1. Cheilocystidia densely cowered with small excrecenses: Mycena mirata
              2. Cheilocystidia smooth
                1. Excrescences of the hyphae of the pileipellis simple to branched, tending to become gelatinized. Very common species: Mycena speirea
                2. Excrescences of the pileipellis simple, not becoming gelatinized. Not found in Norway?: Mycena phaeophylla
          2. Lamellae ascending
            1. Flesh reddening when cut; taste bitter
              2. : Mycena erubescens
            2. Flesh not reddening; taste undistinctive
              1. Cheilocystidia fusiform, smooth: Mycena hiemalis
              2. Cheilocystidia irregularly shaped, with a few coarse, unevenly spaced excrescences. On Quercus: Mycena polygramma (minute form)
              3. Cheilocystidia with densely covered with small excrescences ("warts"): Mycena mirata
        2. Larger species; growing on decaying stumps
          1. Flesh turning red brown spotted with age
            1. Pileus with a completely separable, tough, gelatinous pellicle: Mycena epipterygia var. viscosa
            2. Not with a separable pellicle: Mycena maculata
          2. Not becoming red brown spotted
            1. Cheilocystidia densely covered with "warts": Mycena arcangeliana
            2. Cheilocystidia differently shaped
              1. Cheilocystidia more or less fusiform, smooth
                1. With yellow stipe or reddish brown lamellar edge
                  1. Stipe deep yellow; lamellae sometimes red-brown: Mycena renati
                  2. Stipe grey-brown; lamellae red-brown: Mycena rubromarginata
                2. Differently coloured
                  1. Cheilocystidia large, up to more than 100 my
                    1. Stipe fragile, with a satiny sheen: Mycena niveipes
                    2. Stipe cartilaginous, grey-brown to dark sepia brown: Mycena algeriensis
                  2. Cheilocystidia smaller, apically with a typical slender neck: Mycena abramsii
              2. Cheilocystidia branched
                1. Fascisculate; mostly in mild winter time; spores less than 6 my: Mycena tintinnabulum
                2. Not these characters combined
                  1. Odeur farinaceous, growing fasciculate on old stumps of Quercus: Mycena inclinata
                  2. Odeur indistinctive or not farinaceous
                    1. Stipe silvery grey, coarsely grooved: Mycena polygramma
                    2. Stipe smooth
                      1. Taste farinaceous: Mycena galericulata
                      2. Taste not farinaceous: Mycena maculata
    1. Growing terrestrial or on other substrates. See next key.

© Arne Aronsen 2002-2015