Name requested: Phaeocytostroma ambiguumMycologia 60 (1): 202. Mycological Papers 97: 24.
Homotypic synonym: Sphaeropsis ambiguaMycologia 22 (6): 273. Mycological Papers 97: 24.
Heterotypic synonym: Phaeocytosporella zeaeMycologia 22 (6): 280, 281. 63 (3): 626. Mycological Papers 97: 25.