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 398 UREDINEAE. The anatomical changes exhibited in diseased parts of pear- leaves have been briefly described by Feutzling. He found a radial elongation of the cells of the spongy parenchyma and an accompanying accumulation of starch. Wakker, about the same time, obtained similar results in the case of Crataegus Oxijacantha deformed by G. clavariaeforme (see p. 387). Wakker observed a diminished forma
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 398 UREDINEAE. The anatomical changes exhibited in diseased parts of pear- leaves have been briefly described by Feutzling. He found a radial elongation of the cells of the spongy parenchyma and an accompanying accumulation of starch. Wakker, about the same time, obtained similar results in the case of Crataegus Oxijacantha deformed by G. clavariaeforme (see p. 387). Wakker observed a diminished formation of calcium oxalate; Fentzling, however, found increased deposit of the same salt, not only in the form of Fig. m.—Gymnosporangiuni mbinae in the form of Roeslelin cancellata on leaves of Pear. A few twigs showing the abundance of aecidia over the whole tree. (v. Tubeuf phot.) isolated crystals but as masses. Cork-formation was suspended in Wakker's case, while in Fentzling's a partial formation of cork was distinguishable beneath the epidermis. The increased thickness of diseased leaves is due principally to multiplication of the spongy parenchyma, the upper layers of which frequently become more or less palisade-like. When pycnidia (spermogonia) are formed on the upper leaf-surface, the palisade parenchyma Fentzling (loc. cit.) and Peglion [Rivista di Patologia Vegetale, ii.), also describe these alterations.
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