Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 350 UREDINEAE. Stems, leaf-stalks, and leaf-nervature often undergo one-sided tlnckening and curvature as a result of formation of aecidia. Wakker thus summarizes his observations on the anatomical changes in these malformed parts of Urtica: tliere is an en- largement of cells and an increase in the number of large inter- cellular spaces; no formation of collenchyma, interfascicular cambium, and chlo
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 350 UREDINEAE. Stems, leaf-stalks, and leaf-nervature often undergo one-sided tlnckening and curvature as a result of formation of aecidia. Wakker thus summarizes his observations on the anatomical changes in these malformed parts of Urtica: tliere is an en- largement of cells and an increase in the number of large inter- cellular spaces; no formation of collenchyma, interfascicular cambium, and chlorophyll; a diminished formation of calcium oxalate ; an orange coloration of the cell-sap; and a distension or rupture of the epidermis. Fio. ISa.—/'i/.ccmja co/ricis on Stinging Xettle. The aecidial cushions have caused sweUing and distortion of stems and leaf-stalks, also swollen outgrowths on the leaves, (v. Tubeuf phot.) Klebahn and Magnus believe that there is a Fuccinia on Carex acuta and G. Goodenoughii related to an Accidium on Rihes Grossidaria, B. rubrum, and B. aurecm ; also a Fi/ccmia on Garex riparia with an Aecidium on Hibcs nigrum. (_)n this account Klebahn distinguishes Puce, caricis i., ii., and in., agreeing respectively with P. Pringsheimiana Kleb., P. caricis (Sclmiu.), and P. Magiiusii Kleb. P. Schoeleriana Plowr. et Magn. (lUitain). Uredo- and teleutospores on Gctrcx arenaria; aecidia on Scnccio Jacohaea. 'KleV)ahn, ZeMxrJirift f. Pflanzenkrankhdten, 1892, 1894, and 1895. - Iledingia, 188(5.
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