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 398 UREDINEAE. The anatomical changes exhibited in diseased parts of pear- leaves have been briefly described by Fentzling/ He found a radial elongation of of the spongy parenchyma and an accompanying accumulation of starch. AVakker, about the same time, obtained similar results in the case of Crataegus Oxyacantha deformed by G. clavariaeforme (see p. 387). Wakker observed a diminished form
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 398 UREDINEAE. The anatomical changes exhibited in diseased parts of pear- leaves have been briefly described by Fentzling/ He found a radial elongation of of the spongy parenchyma and an accompanying accumulation of starch. AVakker, about the same time, obtained similar results in the case of Crataegus Oxyacantha 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 Fio. 233.—Gi/mnosporangiaiii sahitiac in the form of liotstcUa. canccllata 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 tlic upper leaf-surface, the palisade parenchyma Fentzling (lor. cit.) and Peglion (Rivista di Patologia Vegetale, ii.), also describe these alterations.
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