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Psathyrella caput-medusae (Fr.) Konrad & Maubl., Encyclop. Mycol. Les Agaricales 14(1): 127 (1948) Agaricus caput-medusae Fr., Epicr. syst. mycol. (Uppsala): 216 (1838) [1836-1838]
Agaricus jerdonii Berk. & Broome, Ann. Mag. nat. Hist. Ser. 3 [Notices of British Fungi No. 913] 7: 375 (1861)
Stropharia caput-medusae (Fr.) P. Karst., Bidr. Känn. Finl. Nat. Folk 32: 493 (1879)
Geophila caput-medusae (Fr.) Quél., Enchir. fung. (Paris): 112 (1886)
Stropharia jerdonii (Berk. & Broome) Sacc., Syll. fung. (Abellini) 5: 1025 (1887)
Psathyrella jerdonii (Berk. & Broome) Konrad & Maubl., Encyclop. Mycol. Les Agaricales, Agaricaceae: 127 (1949) [1948]
Habitat: On decayed wood of conifers, usually large stumps of Picea and Pinus spp.
Notes: Known from a few, scattered locations in Scotland (Perthsire & Inverness-shire). Reported from England (Middlesex) but the specimen in herb. K is labelled 'cf.' C. caput-medusea. Last reported from Wales in 1910 but unsubstantiated with voucher material. Probably genuinely rare since basidiomes are large, distinctive and unlikely to be overlooked.
Distribution: E: ?, S: !, W: ?
Vouchers:
Descriptions, Lists & Icons:
D:, in Hansen, I. & Knudsen, H., Nordic Macromycetes Polyporales, Boletales, Agaricales, Russulales. 2: 474 pp. (1992), p. 238
D+I:, in Courtecuisse. R. & Duhem. B., Mushrooms and Toadstools of Britain & Europe: 480 pp. (1995), p. 266
D+I: The Dutch, French and British species of Psathyrella, in Kits van Waveren, E., Persoonia Supplement 2: 300 pp. (1985), p. 118-121
Conservation Status: Rare (Red Data List, Ing 1992); Vulnerable / D2 (Red Data List, Evans et al. 2006); BAP species
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