Tricholoma acerbum (Bull.) Quél., Mém. Soc. Émul. Montbéliard Sér. 2 5: 77 (1872) Agaricus acerbus Bull., Herb. Fr. (Paris) 12: tab. 571 (1792)
Habitat: On soil, usually associated with Quercus spp. in old deciduous woodland. Also known with Fagus or Castanea.
Notes: Occasional in England. Rarely reported elsewhere but apparently widespread. Most records are from the south and west.
Distribution: E: o, S: !, W: !, NI: !, ROI: !
Vouchers: England: K(M) 67182; Wales: K(M) 140550; NI: K(M) 88701; ROI: K(M) 88695
Descriptions, Lists & Icons: D+I:, in Phillips, R., Mushrooms and other fungi of Great Britain & Europe: 288 pp. (1981), p. 40-41 D+I:, in Breitenbach, J., Kränzlin, F., Fungi of Switzerland Boletes and agarics (1st part) 3: 361 pp. (1991), p. 320, pl. 408 D:, in Hansen, I. & Knudsen, H., Nordic Macromycetes Polyporales, Boletales, Agaricales, Russulales. 2: 474 pp. (1992), p. 187 I:, in Bon, M., The Mushrooms and Toadstools of Britain and North-western Europe: 352 pp. (1987), p. 159 I:, in Courtecuisse. R. & Duhem. B., Mushrooms and Toadstools of Britain & Europe: 480 pp. (1995), p. 197 D:, in anon., Flora Agaricina Neerlandica 4: Critical Monographs of Families of Agarics and Boleti occuring in the Netherlands Strophariaceae, Tricholomataceae (3), (Ed.: C.Bas, Th.W. Kuyper, M.E. Noordeloos & E.C. Vellinga) 4: 191 pp. (1999), p. 120-121 D+I:, in Riva, A., Fungi Europaei 3: Tricholoma (Fr.) Staude 3: 618 pp. (1988), p. 329-335, pl. 50 [p.527] D+I:, in Galli, R., Le Amanite: 216 pp. (2001), p. 186-187
Conservation Status: Vulnerable (Red Data List, Ing 1992); removed from list (Red Data List, Evans et al. 2006)
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