Abstract
An understanding of the influence of environment on the geographic distribution and intensity of rust disease is dependent in part upon determining its influence upon the germination and longevity of spores. Such information about most species of the Melampsoraceae, especially those affecting forest trees, is very meagre. However, studies of the influence of temperature and other external factors upon the spores of Cronartiuln ribicola Fischer have been extensive (3, 4, 7, 8). In addition the influence of temperature upon germination and viability of spores of Cronartium coleosporioides (Diet. and Holw.) Arth. (5) and Cronartium fusiforme (Arth. and Kern) Hedgc. and Hunt (6) has been reported. A plentiful collection of recently formed aecia of Coleosporium solidaginis (Schw.) Thuem. on needles of pitch pine, Pinus rigida Mill., and urediospores on leaves of Solidago caesia L., presented the opportunity to obtain similar information about this rust. The results are
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