IN a letter to NATURE (July 23, 1927, p. 116) Craigie announced the discovery of heterothallism in the rust fungi. In a second letter (Nov. 26, 1927, p. 765) he showed that the æcial stage of Puccinia ...
THE recognition of the + and - strains in rust fungi and the way in which the bi-nucleate aecial condition must be preceded by myeelial fusion of + and - strains or the introduction of ...
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