. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. r)46 THE PATHOGENIC ALGAE. but several inhabit nqxdicac, chiefly species of Anthoccros, Blasia, Piilia, Aneura, Diplolaena, Sauteria, and Biccift. 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. Onl}'- one filament is admitted into each cavity, then the op
. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. r)46 THE PATHOGENIC ALGAE. but several inhabit nqxdicac, chiefly species of Anthoccros, Blasia, Piilia, Aneura, Diplolaena, Sauteria, and Biccift. 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. Onl}'- 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 nmltiplies to form a colony. Leitgeb states that after infection has successfully taken place, and frequently before the stoma has quite closed, the guard-. FiQ. '6iZ.—AiKibiiij-aa azuilae. Longitudinal section througli tiie posterior lobe of a floating leaf of Azolla airoliniana. The cavity is filled with lYosioc-filaments and septate hairs. 1, A septate hair, and a filament of Analnuna. (v. Tubeiif 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 Anthoccros Icievis the tubes form a kind of pseudoparenchyma ^Bibliography. Janczewski, Botan. Zeituixj, 1872, ami Annales d. aci. natur., Ser. 5, xvi. Milde, Botan. Zeihing, 1851. Leitgeb, Akadcmie d. Wissen- schaften in Wien, 1878; also iiher Leherinoose, I. Goebel, "Die iMuscineen," in Schenk's Haudhuch d. Botanik, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i
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