Abstract
Puccinia chrysanthemi on Chrysanthemum morifolium has been described as a hemi-form rust with uredinial and telial states. However, spermogonial state was found on leaves of C. morifolium inoculated with teliospores and also on infected leaves of C. morifolium collected from fields in early summer. P. chrysanthemi, therefore, has a brachy-form life cycle and is an autoecious species. In teliospore germination, two kinds of basidia were observed; the one with a binucleate cell and two uninucleate cells, the other with four uninucleate cells. Both binucleate and uninucleate basidiospores were formed.
