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Veil arachnoid,
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Gills adnate, powdery from spores
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Cortinarius.
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Gills decurrent or adnate, mostly epiphytal
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Flammula.
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Gills somewhat sinuate, cuticle of the pileus silky, or bearing fibrils
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Inocybe.
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Cuticle smooth, viscid
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Hebeloma.
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Gills separating from the hymenophore and decurrent
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Paxillus.
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b. Stem lateral or absent
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Crepidotus.
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B. Stem cartilaginous,
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Gills decurrent
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Tubaria.
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Gills not decurrent,
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Margin of the pileus at first incurved
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Naucoria.
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Margin of pileus always straight,
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Hymenophore free
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Pluteolus.
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Hymenophore confluent
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Galera.
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Gills dissolving into a gelatinous condition
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Bolbitius.
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IV. Spores purple-brown.
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A. Stem not cartilaginous,
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Pileus easily separating from the stem,
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Volva present, ring wanting
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Chitonia.
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Volva and ring wanting
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Pilosace.
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Volva wanting, ring present
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Agaricus.
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Gills confluent, ring present on stem
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Stropharia.
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Ring wanting, veil remaining attached to margin of pileus
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Hypholoma.
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B. Stem cartilaginous,
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Gills decurrent
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Deconia.
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Gills not decurrent, margin of pileus at first incurved
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Psilocybe.
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Margin of pileus at first straight
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Psathyra.
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V. Black spored mushrooms.
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Gills deliquescent
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Coprinus.
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Gills not deliquescent,
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Gills decurrent
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Gomphidius.
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Gills not decurrent, pileus striate
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Psathyrella.
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Pileus not striate, ring wanting, veil often present on margin
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Panæolus.
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Ring wanting,
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