Basionym Name:Agaricus alboquadratus Berk., [as 'albo-quadratus'] Ann. Mag. nat. Hist., Ser. 5 15: 386 (1885)
Homotypic synonyms:Psilocybe alboquadrata (Berk.) Sacc., Syll. fung. (Abellini) 5: 1043 (1887)