Rhodocollybia butyracea (Bull.) Lennox, Mycotaxon 9: 218 (1979) Agaricus butyraceus Bull., Herb. Fr. (Paris) 12: tab. 572 (1792) Agaricus leiopus Pers., Tent. disp. meth. Fung.: 21 (1797) Agaricus butyraceus γ asemus Fr., Observ. mycol. (Leipzig) 2: 124 (1818) Agaricus asemus (Fr.) Fr., Syst. mycol. (Lundae) 1: 121 (1821) Collybia butyracea (Bull.) P. Kumm., Führ. Pilzk. (Zwickau): 117 (1871) var. butyracea Collybia butyracea (Bull.) P. Kumm., Führ. Pilzk. (Zwickau): 117 (1871) Collybia asema (Fr.) Gillet, Hyménomycètes (Alençon): 317 (1876) [1878] Agaricus bibulosus Massee, Grevillea 20(no. 95): 95 (1892) Collybia bibulosa (Massee) Massee, Brit. Fung.-Fl. (London) 3: 125 (1893) Collybia butyracea var. bibulosa (Massee) Rea, Brit. basidiomyc. (Cambridge): 331 (1922) Collybia butyracea f. asema (Fr.) Singer, Lilloa 22: 201 (1951) [1949] Collybia butyracea var. asema (Fr.) Quél., Enzyklopädie der Pilze Band 2: Schnecklinge, Trichterlinge, Ritterlinge, Rötlinge, Wulstlinge u.a. (München): 427 (1987) Rhodocollybia butyracea f. asema (Fr.) Antonín, Halling & Noordel., Mycotaxon 63: 365 (1997)
Habitat: Saprotrophic, on soil amongst litter under coniferous, and less often deciduous, trees.
Notes: Frequent and widespread, but apparently less so than the var. asema..
Distribution: E: c, S: c, W: c, NI: c, ROI: c, Other: Channel Islands: ! Isle of Man: !
Vouchers: England: K(M) 117253; Scotland: K(M) 86598; NI: K(M) 82872
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