. Fig. 8. Caeoma deformans. The nest-like structures are much-branched, leafless shoots with each of their twigs ending in a caeoma-disc. (v. Tubeuf phot.) The galls produced by Ustilnr/o Trcuhii on Polyfjonum Saccha- linensc are particularly interesting. Here, as a result of the presence of the parasite, there are formed the so-called vegetative canker-galls, and in addition, the fruit-galls, new organs derived from lateral outgrowths of the host-plant, and of use only in the spore-formation of the Ustilago; they contain a special capillitium-like tissue, and serve exclusively for the shelter

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. Fig. 8. Caeoma deformans. The nest-like structures are much-branched, leafless shoots with each of their twigs ending in a caeoma-disc. (v. Tubeuf phot.) The galls produced by Ustilnr/o Trcuhii on Polyfjonum Saccha- linensc are particularly interesting. Here, as a result of the presence of the parasite, there are formed the so-called vegetative canker-galls, and in addition, the fruit-galls, new organs derived from lateral outgrowths of the host-plant, and of use only in the spore-formation of the Ustilago; they contain a special capillitium-like tissue, and serve exclusively for the shelter and distribution of the fungus-spores.