Abstract
Plasmopara latifolii sp. nov. and Mycosphaerella chamaenerii sp. nov. are described on Epilobium latifolium. Endophyllum alaskanum sp. nov. is described on Epilobium anagallidifolium. The host and morphological distinctions of Pucciniastrum epilobii and P. pustulatum are discussed. Host and geographic range extensions, particularly in Canada, are given for Synchytrium spp., Peronospora arthuri, Plasmopara epilobii, Erysiphe polygoni, Sphaerotheca macularis, Doassansia epilobii, Pucciniastrum spp., Puccinia veratri, P. circaeae, P. gigantea, P. scandica, P. epilobii ssp. palustris, Septoria oenotherae, and Ramularia montana.

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