1. Odeur indistinctive or not raphanoid, nitrous, farinaceous
    1. Lamellae broadly adnate to decurrent
      1. Growing exclusively on dead, standing culms of Phragmites australis just above the level of stagnant water: Mycena belliae
      2. Growing densely cespitose on fern rhizomes: Mycena lohwagii
      3. Two-spored, clampless: Mycena pseudopicta
      4. Four-spored, clamped
        1. The base of the stipe densely coloured with yellow fibrils: Mycena picta
        2. Not with such colour
          1. Stipe glutinous to viscous when wet; on needle beds under coniferous trees: Mycena clavicularis
          2. Stipe dry, typically growing in Sphagnum: Mycena concolor
    2. Lamellae ascending, more or less narrowly adnate
      1. Lamellar edge coloured pale yellow, orange or red brown
        1. Lamellar edge yellow
          1. Odeur of raw potatoes; cheilocystidia with "warts": Mycena flavescens
          2. Odeur indistinctive; cheilocystidia smooth to somewhat branched: Mycena citrinomarginata
        2. Lamellar edge olive, brownish, red-brown to bright orange
          1. Lamellar edge bright orange; the base of the stipe with orange fibrils: Mycena aurantiomarginata
          2. Lamellar edge olive or brownish or red-brown: Mycena olivaceomarginata
      2. Lamellar edge concolorous with the lamellar sides
        1. Cheilocystidia densely covered with small excrescences ("warts")
          1. Pileus yellowish or with a yellow tinge, or greenish to olive green
            1. Odeur of raw potatoes when crushed: Mycena flavescens
            2. Odeur of iodoform on drying out; lamellae tending to to turn pinkish to flesh colured with age: Mycena arcangeliana
            3. Odeur of iodoform when drying out; lamellae never turning pinkish; associated with sandy soil in coastal sand dunes: Mycena chlorantha
          2. Pileus devoid of yellow colours
            1. Growing on wood: Mycena arcangeliana
            2. Growing on the ground
              1. Smell of iodoform after having been kept in a box for a while
                1. Pileus pale grey to dark brown, mostly tinged with flesh-colour or vinaceous-pink colour: Mycena metata
                2. Pileus pale grey to fairly dark brown, without any red or pinkish colours: Mycena filopes
                3. Pileus entirely fulvous, turning more ochraceous with age; growing in alpine areas: Mycena alexandri
              2. No such smell
                1. Odeur of pelargonium; many of the cheilocystidia saccate or shaped as hour-glasses: Mycena septentrionalis
                2. Odeur of raw potatoes when crushed; lamellar edge faintly yellow to citrine: Mycena flavescens
                3. Odeur indistinctive; pileus with a bluish tint, at least in young specimens: Mycena urania
                4. Alpine species: Mycena alexandri
        2. Cheilocystidia differently shaped
          1. Stipe embedded in a thick gelatinous layer: Mycena rorida
          2. Stipe not embedded in gelatinous matter
            1. Cheilocystidia fusiform to clavate; densely covered with short excrescences in the wider parts of the cystidia: Mycena latifolia
            2. Cheilocystidia differently shaped aetites, aronseni
              1. Growing on fallen leaves of Fagus: Mycena fagetorum
              2. Growing in other habitats
                1. Stipe usually longitudinally grooved
                  1. Stipe whitish above, darker brown below; growing in different habitats, in often in sphagnum or on boggy ground under conifers: Mycena megaspora
                  2. Stipe grey to brownish grey, silvery on drying out; often accosiated with Quercus:Mycena polygramma
                2. Stipe different
                  1. All hyphae and hymenial elements clampless: Mycena vitilis
                  2. Hyphae with clamp connections
                    1. Hyphae of the cortical layer of the stipe covered with excrescences; terminal cells infrequent and unobtrusive: Mycena aetites
                    2. Hyphae of the cortical layer of the stipe covered with curved to more ore less coiled excrescences: Mycena aronsenii

© Arne Aronsen 2002-2015