Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 546 THE PATHOGENIC ALGAE. but several inhabit Hepaticcui, chiefly species of Anthoceros, Blasia, Pcllia, Ancura, Diplolaena, Sauteria, and Jiiccia. Nostoc lichenoides Vauch. is a common endophyte in the mucilage-cavities of Anthoceros laevis. The motile algal filaments gain admission through the stomata or mucilage-fissures on the lower side of the thallus. Only
Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 546 THE PATHOGENIC ALGAE. but several inhabit Hepaticcui, chiefly species of Anthoceros, Blasia, Pcllia, Ancura, Diplolaena, Sauteria, and Jiiccia. Nostoc lichenoides Vauch. is a common endophyte in the mucilage-cavities of Anthoceros laevis. The motile algal filaments gain admission through the stomata or mucilage-fissures on the lower side of the thallus. Only one filament is admitted into each cavity, then the opening is closed by an increased turgescence and growth of the guard-cells; the imprisoned Nostoc multiplies to form a colony. Leitgeb states that after infection has successfully taken place, and frequently before the stoma has quite closed, the guard- Fio. 323.—Anahaena azolLae. Longitudiual section through the posterior lobe of a floating leaf of Asolla caroliniana. The cavity is filled with (oc-filaments and septate hairs. 1, A septate hair, and a filament of Anahaena. (v. Tubeuf del.) cells divide and ultimately form a three-layered covering of cells over the intercellular space. Simultaneously all the thallus- cells round the infected cavity undergo radial division and grow into the cavity, first as papillae, then as much-branched and septate tubes of various lengths; the space left between them becomes meanwhile filled with the Nostoc. In the case of Anthoceros laevis the tubes form a kind of pseudoparenchyma Bibliography: Janczewski, Botan. Zeitung, 1872, and Annates d. ,sci. nalur., Ser. 5, xvi. Milde, Botan. Zeitung, 1851. Leitgeb, Akademie d. Wissen- Hchaften in Wien, 1878; also Untersnchwigen iiher Lebermoose, I. Goebel, 'Die Muscineen,' in Schenk's Handbuch d. Botanik, 1882.
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