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 542 THK I'ATHOGENIC ALGAE. naked eye by bluisli-green spots on sections of stems and rhizomes of the host (Fig. 319). These originate as follows: the species of Gunncra possess charac- teristic mucilage-secreting organs, in the form of fissures of the leaf-tip, collaters on the leaves, and glands on the stems. Merker found that these glands originated endogenously in the growing point between each pa
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 542 THK I'ATHOGENIC ALGAE. naked eye by bluisli-green spots on sections of stems and rhizomes of the host (Fig. 319). These originate as follows: the species of Gunncra possess charac- teristic mucilage-secreting organs, in the form of fissures of the leaf-tip, collaters on the leaves, and glands on the stems. Merker found that these glands originated endogenously in the growing point between each pair of leaves. The mature glands are covered only by the epidermis, and when activity commences the uppermost cells of the gland-tip, after swelling, become detached and converted into slime (Fig. 320). Ultimately the epidermis is ruptured by the pressure of the slime, and the remaining glandular cells are in turn rapidly transformed into the same substance. Via. 31'.i.—No.'<toc fit'.nnerae. Longi- tudinal .section through the apex of a stem of (liumtra niauirata. The punc- tated spots indicate the position of ostO''-colonies. (v. Tubeuf del.)
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