Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 30 REACTION OF HOST TO PARASITIC ATTA<JK. Still more striking are certain structures resembling witches' brooms, which are produced on Thujopsis dolahrata in Japan, under the influence of the mycelium of Cdeoirui deformans (Fig. 8). These consist of leafless non-chlorophyllous axes, dichotomously branched, and with each branch ending in a disc. They arise from shoots or leaves of the Thujopsis wher
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 30 REACTION OF HOST TO PARASITIC ATTA<JK. Still more striking are certain structures resembling witches' brooms, which are produced on Thujopsis dolahrata in Japan, under the influence of the mycelium of Cdeoirui deformans (Fig. 8). These consist of leafless non-chlorophyllous axes, dichotomously branched, and with each branch ending in a disc. They arise from shoots or leaves of the Thujopsis where structures of the kind would never have arisen normally, and are wholly sub- servient to the reproduction of the fungus, which forms its sori under the epidermis of the terminal discs. 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.
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