Abstract
The adaptation of the genus Chrysomyxa to a short growing season is discussed. Keys are given to the aecial and to the uredinial or telial stages of species that occur in North America. Range extensions are given, particularly for northern Canada. C. Rhododendri, newly reported in North America, and C. Cassandrae are shown to be barely distinguishable from C. Ledi and are made varieties of it. C. Woronini is reported for the first time in North America.

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