Agaricus foetens Pers., Observ. mycol. (Lipsiae) 1: 102 (1796)
Cap: 5-10 cm diameter, at first firm, becoming fragile, at first nearly globose, expanding and becoming plane to slightly depressed, yellowish or dingy ochraceous, glabrous, viscid, pellicle separable part way to the disk, margin widely and coarsely tuberculate-striate.
Flesh: thin, rather fragile, dingy white, yellowish under the pellicle, taste acrid, odor strong, resembling bitter almonds, then fetid.
Gills: adnexed, rather close, broad, at first whitish, becoming yellowish with age and dingy when bruised, exuding drops of water when young, some forked.
Stem: 5-12 cm high, 1.5-4 cm thick, equal or slightly tapering downwards, veined, white or dingy brown in age or when bruised, stuffed, becoming hollow.
Spores: hyaline, globose to subglobose, 8-10 x 7-9 µm, ornamented with warts.
Spore print: pale yellow.
Habitat: gregarious on the ground in mixed woods, summer to autumn. Common.
Chemical tests: flesh salmon-pink with FeSO4.
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A number of marasmane sesquiterpenes have been isolated from the fruiting bodies of Russula foetens:
– 8α,13-dihydroxy-marasm-5-oic acid γ-lactone
– 13-hydroxy-marasm-7(8)-en-5-methoxy γ-acetal
– 7α, 8α, 13-trihydroxy-marasm-5-oic acid γ-lactone
Polysaccharides extracted from the mycelial culture of R. foetens and administered intraperitoneally into white mice at a dosage of 300 mg/kg inhibited the growth of Sarcoma 180 and Ehrlich solid cancers by 70% (Ohtsuka et al., 1973).
See some more photos of the fetid russula at BioPix
Ohtsuka S, Ueno S, Yoshikumi C, Hirose F, Ohmura Y, Wada T, Fujii T, Takahashi E.
Polysaccharides having an anticarcinogenic effect and a method of producing them from species of Basidiomycetes.
UK Patent 1331513, 26 September 1973.
Wang XN, Wang F, Du JC, Ge HM, Tan RX, Liu JK.
A new marasmane sesquiterpene from the basidiomycete Russula foetens.
Zeitschrift Für Naturforschung Section B-A J Chemical Sciences 2005 60(10): 1065-7.