Basionym: Agaricus prunulus Scop., Flora carniolica 2: 437, no 1508 (1772) [MB#150042] Obligate synonyms: - Paxillus prunulus (Scop.) Fr. (?) [MB#492602] - Paxillopsis prunulus (Scop.) J.E. Lange, Flora Agaricina Danica 5: VI (1940) [MB#456167] - Pleuropus prunulus (Scop.) Murrill, N. Amer. Flora (1917) [MB#503421] - Paxillus prunulus var. prunulus (Scop.) Fr. (?) [MB#569775] Taxonomic synonyms: - Agaricus orcella Bull., Herbier de la France 13: t. 591 (1793) [MB#181557] - Paxillus prunulus var. orcella (Bulliard) Quélet, Enchiridion Fungorum in Europa media et praesertim in Gallia Vigentium: 92 (1886) [MB#802800] - Agaricus neptuneus Batsch, Elenchus fungorum. Continuatio prima: 161, t. 23:118 (1786) [MB#201475] - Clitopilus orcellus (Bull. ex Pers.) P. Kumm., Der Führer in die Pilzkunde: 97 (1871) [MB#146838] - Agaricus orcellus Bull., Synopsis methodica fungorum: 473 (1801) [MB#491997] - Pleuropus orcellus (Bull. ex Pers.) Gray, A natural arrangement of British plants 1: 615 (1821) [MB#486499]