Some Viewpoints on the Phylogeny of Rust Fungi. VI. Biogenic Radiation

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Abstract
The phenomenon of biogenic radiation of heteroecious rust fungi to their congenial hosts is defined and illustrated in this paper. Several examples show that the primary stage of a heteroecious rust appears to live on hosts phylogenetically older than the secondary hosts of the same rust. The congenial relationship between host and parasite, therefore, helps to estimate the relative phylogenetic age of plant groups involved. The biogenic radiation of crown rust, Puccinia coronata, and the successive evolution of blister rusts of the genus Cronartrum are described and illustrated. For practical purposes such biogenic study of rust fungi helps to detect the gene centers of cultivated plants and their wild progenitors.

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