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 39G UREDINEAK Jun. virgiiiiana, and Jim. pkocnicea. (A reported oecurrence ou Finns halqjcnsis is probably an error.) The sporogenoiis cushions are little dark-lnown protuberances which l)i-(3ak forth in spring from swellings, or on green Fig. 230.—Gymnos/toronfjium snhirKie on twigs of Junipirun SdOimi, at the time of lilionition of spores, (v. Tubeuf jihot.) twigs and scale-leaves. These bodies a
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 39G UREDINEAK Jun. virgiiiiana, and Jim. pkocnicea. (A reported oecurrence ou Finns halqjcnsis is probably an error.) The sporogenoiis cushions are little dark-lnown protuberances which l)i-(3ak forth in spring from swellings, or on green Fig. 230.—Gymnos/toronfjium snhirKie on twigs of Junipirun SdOimi, at the time of lilionition of spores, (v. Tubeuf jihot.) twigs and scale-leaves. These bodies absorb water, swell, and run together, forming transparent gelatinous masses (Figs. 230 and 231). The teleutospores resemble those of G. juniperinu7n, but have only four germ-pores; they germinate on the gelatinous masses, and produce promycelia and sporidia. The latter germinate at once, chiefly on leaves of Pyrus com- munis. The pycnidia are produced on the upper epidermis as sticky yellow spots bearing darker dot-like pycnidia. The aecidia (Boestelia canceUata) are found in September on the under-surface of the leaves of pear, also on leaf-petioles, young shoots, and even on the fruits. The peridia differ from both
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