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Remarks (public):For a complete description including images see 
Remarks (internal):Selected colour illustrations: Breitenbach & Kränzlin: pl. 289; Miller: pl. 112; Moser/Jülich: III Marasmius 5. The fungus is a good edible species with a potential for cultivation (Singer & Harris, 1987). It releases cyanic acid (Lebeau & Hawn, 1963).
Description type:Non-original description 
Description:Marasmius oreades (Bolton: Fr.) Fr., Epicr. syst. mycol.: 375, 1838.
Agaricus oreades Bolton, Hist. fung. Halifax: pl. 151, 1792.
Agaricus oreades Bolton: Fr., Syst. mycol. 1: 127, 1821.
Basidioma cespitose or in groups, often forming distinct rings. Pileus semiglobose when young, soon becoming convex to flat with broad umbo, 20-40 mm diam., cream to pale brownish, hygrophanous. Gills adnate, becoming broad in age, cream. Stipe equal, solid, 20-60 mm long, 2-5 mm thick, tomentose, cream coloured, with white basal tomentum, often twisted. Context whitish. Smell fragrant. Spores smooth, without germ pore, 6,0-9,0 x 4,0-5,0 µm, L/W = 1,3-1,9, hyaline, non-amyloid.Basidia 39-52 x 6-8 µm, with 4 sterigmata, hyaline, with basal clamps. Cheilocystidia absent. Pleurocystidia absent. Hymenophoral trama interwoven. Cuticle a hymeniderm formed by clavate hyphae which may be irregular and occasionally slightly thick-walled. Trama of pileus and stipe slightly dextrinoid. Caulocystidia absent, but occasionally stipe with protruding hyphal ends with slightly rough surface. Clamps present in all parts of the fruit body.
Hosts: Occurs in grassland.
Disease: Forms 'fairy' rings, killing grass along the margin, but promoting its growth beyond the mycelial zone.
Geographical distribution: North America, Argentina, Europe, North Africa, Canary Islands, Asia, Australia (Dennis, 1986).
Physiological specialization: None known.
Transmission: Via airborne basidiospores.
Literature: Breitenbach, J. & Kränzlin, F., Fungi of Switzerland. Volume 3 (1). Boletes and agarics. Edition Mykologia, Lucerne, 1991 (colour illustration); Dennis, R.W.G., Fungi of the Hebrides. Royal Botanic Gardens, Kew, 1986 (distribution); Lebeau, J.B. & Hawn, E.J., Phytopathology 53: 1395-1396, 1963 (chemical compounds); Miller, O.K., Jr., Mushrooms of North America. Dutton, New York, 1972 (colour illustration); Moser, M. & Jülich, W., Colour atlas of basidiomycetes. Gustav Fischer Verlag, Stuttgart, 1985-1995 (colour illustration); Singer, R. & Harris, B., Mushrooms and Truffles. Koeltz, Koenigstein, 1987 (cultivation).

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