Name requested: Agaricus arcuatus var. cognatusPersoonia 13 (4): 414.
Homotypic synonym: Melanoleuca cognataMycologia 45 (6): 882. 57 (4): 586. Mycology and Phytopathology [as Микология и Фитопатология] 8 (5): 404. Mycotaxon 60: 219. 81: 142. 83: 123. Persoonia 13 (4): 413, 414*, 415, 416. Sydowia 15 (1-6): 173. 26 (1-6): 97.