Name requested: Agaricus festivusSydowia 29 (1-6): 53.
Homotypic synonym: Phaeocollybia festivaMycologia 64 (5): 1142. Mycology and Phytopathology [as Микология и Фитопатология] 3 (2): 129, 130. 5 (1): 86. Mycotaxon 52 (2): 409, 413, 415. 54: 123. 57: 115. 81: 95, 96, 106, 107, 108. Sydowia 4 (1-6): 119. 15 (1-6): 176. 29 (1-6): 34, 53.