Basionym: Psalliota hortensis var. bispora J.E. Lange, Dansk botanisk Arkiv 4 (12): 8 (1926) [MB#375429] Obligate synonyms: - Psalliota bispora (J.E. Lange) F.H. Møller & Jul. Schäff., Annales Mycologici 36 (1): 69 (1938) [MB#251011] - Psalliota hortensis f. bispora (J.E. Lange), Dansk botanisk Arkiv 4 (12): 8 (1926) [MB#267375] - Agaricus subfloccosus var. bisporus (J.E. Lange) Hlavácek, Mykologický Sborník: 68 (1951) [MB#117229] - Agaricus bisporus (J.E. Lange) Singer: 431 (1951) [MB#532320] Taxonomic synonyms: - Agaricus brunnescens Peck, Bulletin of the Torrey Botanical Club 27: 16 (1900) [MB#211944] - Agaricus campestris var. hortensis Cooke, Handbook of British fungi 1: 138 (1871) [MB#444473] - Psalliota hortensis (Cooke) J.E. Lange, Dansk botanisk Arkiv 4 (12): 8 (1926) [MB#356557] - Agaricus cookeanus Bon, Documents Mycologiques 16 (61): 16 (1985) [MB#102998] - Agaricus hortensis (Cooke) S. Imai, Journal of the Faculty of Agriculture of the Hokkaido Imperial University 43: 258 (1938) [MB#267369] - Agaricus hortensis (Cooke) Pilát, Acta Musei Nationalis Pragae 7B (1): 37 (1951) [MB#292271] - Agaricus bisporus var. hortensis (Cooke) anon. ined. (?) [MB#439372] - Psalliota campestris var. hortensis (Cooke) Lloyd, Mycological Writings 1 (4): 26 (1899) [MB#293279] - Agaricus cookeianus Bon (1985) [MB#190689] - Agaricus bisporus (J.E. Lange) Imbach, Mitteilungen der Naturforschenden Gesellschaft Luzern 15: 15 (1946) [MB#531546] - Agaricus campester var. hortensis Cooke (1871) [MB#190339]