Name requested: Pythium hydnosporumMycologia 63 (2): 286, 287. Mycology and Phytopathology [as Микология и Фитопатология] 2 (5): 420, 421, 422, 423, 424, 425, 426, 427. Sydowia 37: 210.
Heterotypic synonym: Pythium artotrogusMycologia 24 (1): 18, 27, 32, 37, 47, 57, 59, 60. 24 (6): 505. 60 (1): 195. 60 (6): 1245. Mycology and Phytopathology [as Микология и Фитопатология] 2 (5): 421. 3 (1): 103. 7 (6): 494, 496, 497. 8 (3): 195, 196, 197, 198, 199, 200.
Heterotypic synonym: Pythium artotrogus var. macracanthumMycologia 24 (1): 47, 54. 63 (5): 982. Mycology and Phytopathology [as Микология и Фитопатология] 2 (5): 421.