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 GYMNOSPORANGIUM. 395 The strikingly characteristic cleavage of the wood by the overgrown elements of the medullary rays and the wood- parenchyma, in the case of the twig-inhabiting form, will be seen from the figures (Fig. 229). As already noticed, the sporogenous cushions are generally formed on one side. After

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