1. Growing terrestrial or on other substrates
    1. Odeur distinctive; raphanoid, nitrous, farinaceous
      1. Odeur and taste raphanoid (of raddish)
        1. Lamellae ascending
          1. Lamellae becoming horizontal; the lamellar edge dark purplish brown: Mycena pelianthina
          2. The lamellar edge not coloured
            1. Pileus lilaceous to more pinkish: Mycena pura
            2. Pileus more distinctly pinkish: Mycena rosea
        2. Lamellae subhorizontal to decurrent
          1. Pileus pale brown with a lilaceous or pinkish tint; spores inamyloid: Mycena pearsoniana
          2. Pileus pale brown with a lilaceous or pinkish tint; spores amyloid: Mycena kuehneriana
      2. Odeur nitrous
        1. Occuring in the spring, may - june
          1. On fallen (mostly buried) cones of Picea: Mycena strobilicola
          2. On roots and decayed stumps of Picea: Mycena silvae-nigrae
        2. Occuring in the autumn
          1. Growing on conifer wood
            1. The lamellar edge coloured olive-green to brownish: Mycena viridimarginata
            2. The lamellar edge not coloured: Mycena stipata
          2. Terrestrial
            1. The lamellar edge coloured yellow- brown to red-brown (sometimes coloured only very close to the margin of the pileus): Mycena olivaceomarginata
            2. The lamellar edge red-brown to purplish brown; the sides densely punctate with minute, red-brown dots (pleurocystidia): Mycena capillaripes
            3. The lamellar edge not coloured
              1. The hyphae of the cortical layer of the stipe smooth
                1. Stipe pruinous; with much inflated terminal cells: Mycena leptocephala
                2. Stipe glabrous; terminal cells scarce, clavate: Mycena parca
                3. Pileus conspicuously black (at least) in the center, like burned wood: Mycena ustalis
                4. Hyphae of the pileipellis with large, variously shaped terminal cells, clampless: Mycena austera
              2. The hyphae of the cortical layer of the stipe diverticulate
                1. Hyphae of the pileipellis with large, variously shaped terminal cells, clampless: Mycena austera
                2. The stipe when fresh exuding a watery fluid when incised, the cheilocystidia with a typical slender neck: Mycena abramsii
      3. Odeur farinaceous
        1. Pileus dark brown to pale grey; lamellae broadly adnate to somewhat decurrent: Mycena cinerella
    2. Odeur indistinctive or not raphanoid, nitrous or farinaceous. See next key

© Arne Aronsen 2002-2015