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 GYMNOSPORANGIUM. 399 of the spot in question is either completely destroyed or trans- formed into irregular cells, separated by intercellular spaces. The anatomical changes in swellings (Fig. 235) induced by G. sabinae on' Junipenis Sdbina were investigated by Woernle with the following results. Wood, bast, and rind are increased round the whole circumference of the stem. Along with the broadening of
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 GYMNOSPORANGIUM. 399 of the spot in question is either completely destroyed or trans- formed into irregular cells, separated by intercellular spaces. The anatomical changes in swellings (Fig. 235) induced by G. sabinae on' Junipenis Sdbina were investigated by Woernle with the following results. Wood, bast, and rind are increased round the whole circumference of the stem. Along with the broadening of the year-rings, however, there occurs a change in the structure of the diseased wood. The same Fig. 234.—A few leaves enlarged from Fig. 233. The leaf to left hand bears pycnidia on red spots on the upper surface of the leaf; the remaining leaves bear aecidia on raised portions of their surface. Several aecidia still further enlarged show the peridia dehiscing by longitudinal slits, (v. Tubeuf del.) tissues occur in the year-rings as already described for G. davariaeforme, viz. thickened twisted tracheids, loosely connected together and with fissure-like pits; medullary rays more numerous and broader; the limits of the year-ring difficult to distinguish; and a yellow pigment deposited in the walls of all the elements. A tissue of this nature may be found round the whole circumference of a twig even in the first year after infection, and regularly each succeeding year. Woernle only rarely found zones of irregular cell-formation like those
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