Abstract
Rodenhiser and Hurd-Karrer1, working with Puccinia graminis tritici, observed the fusion of spherical ‘fusion bodies’ produced by certain germ tubes with germ tubes of other uredospores. They noted that “the body envelopes the contacted hypha as would a viscous drop”; in some cases dissolution of the germ tube wall at the point of contact was seen. In one case movement of the granular contents of the hypha with which contact was made into the fusion body was observed. The work of Nelson, Wilcoxson and Christensen2 provided genetical evidence for fusion between germ tubes, but although they observed fusions they gave no cytological details.
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