Abstract
Uredinial-telialPuccinia fungi onCarex shimizuensis in Nagano Pref. and onC. dimorpholepis in Ibaraki Pref. were proven to host-alternate onPetasites japonicus by field observations and inoculation experiments. These fungi from the two localities were morphologically similar and were compared with three describedPuccinia species that host-alternate betwenCarex species andP. japonicus in Japan, i.e.,P. caricis-petasitidis, P. caricis-flabellatae andP. caricis-podogynae. The three previously described species and the newly foundPuccinia fungi were morphologically indistinguishable at all stages of the life cycle; therefore, it was concluded that three species and the two newly found fungi are taxonomically identical, in whichP. caricis-petasitidis has nomenclatural priority.
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