Name requested: Agaricus postiiMycologia 62 (1): 10. Mycotaxon 82: 151, 162. Sydowia 15 (1-6): 50.
Homotypic synonym: Omphalina postiiMycologia 39 (1): 83, 84. 62 (1): 3, 4, 6, 10, 11. Mycotaxon 50: 398. 82: 158.
Homotypic synonym: Gerronema postiiMycologia 62 (1): 10. 64 (4): 827. Mycology and Phytopathology [as Микология и Фитопатология] 8 (4): 293, 295, 296. Mycotaxon 31 (1): 83. 82: 158, 162. Sydowia 15 (1-6): 50.