Melampsora euphorbiae-geniculatae F. Kern & Thurst., Mycologia 36(5): 507, 1944. VENEZUELA, Edo. Anzoátegui, near Barcelona, banks of Neverí river, on Euphorbia geniculata Ortega, 26 May 1938, Chardón. CUP, holotype; VIA 2673, isotype.