Basionym: Agaricus thomsonii Berk. & Broome, Annals and Magazine of Natural History 17: 131 (1876) [MB#455977] Obligate synonym: Entoloma thomsonii (Berk. & Broome) Sacc., Sylloge Fungorum 5: 693 (1887) [MB#216827] Taxonomic synonyms: - Pluteus cinereus Quél., Annls Sci. nat. Bordeaux: 3 (1884) [MB#231368] - Pluteus cinereus var. venosus Vacek, Studia Bot. Cechosl.: 47 (1948) [MB#346346] - Pluteus cinereus f. evenosus Kühner, Bulletin de la Société Mycologique de France 72 (3): 181 (1956) [MB#347442] - Pluteus thomsonii f. evenosus (Kühner) Wuilb., Miscellanea Mycologica: 16 (1986) [MB#446250] - Agaricus thompsonii Berk. & Broome (1876) [MB#454295] - Pluteus thonsoni (Berk. & Broome) Dennis (1948) [MB#277363] - Agaricus thomsoni Berk. & Broome (1876) [MB#580083]