A number of pycnidial fungi described from Atriplex and Chenopodium, in Europe, North- and South-America are brought into synonymy with Phoma variospora nom. nov., Phoma dimorphospora (Speg.) comb. nov. and Ascochyta caulina (P. Karst.) comb. nov. Descriptions of these species in vivo and in vitro are given and the differentiating characters are discussed. A. caulina represents the type species of Chaetodiplodia P. Karst., which genus is reduced to the level of a section of Ascochyta Lib.