Agaricus bisporus (Lange) Imbach var. bisporus
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Callac P, et al. Morphological, genetic, and interfertility analyses reveal a novel, tetrasporic variety of Agaricus bisporus from the Sonoran Desert of California. Mycologia 85: 835-851, 1993.
Kerrigan RW, et al. The heterothallic life cycle of Agaricus bisporus var. burnetti and the inheritance of its tetrasporic trait. Exp. Mycol. 18: 193-210, 1994.