. Nature and development of plants. Botany. Fig. 155. Fig. 156. Fig. 155. Appearance of one of the powdery mildews, Uncinula, on leaf of elm. Fig. 156. Enlarged view of the mycelium, ascocarp, etc., of one of the mildews, Erysiphe: c, erect hyphae forming spores or conidia; h, haustoria penetrating epidermis of leaf; a, ascocarp or perithecium. plant having these substances. If this material is absent from the plant then it is immune and it has been shown in a few cases where individual plants were not subject to a plant disease that this was due to the lack of a substance which the infested p
. Nature and development of plants. Botany. Fig. 155. Fig. 156. Fig. 155. Appearance of one of the powdery mildews, Uncinula, on leaf of elm. Fig. 156. Enlarged view of the mycelium, ascocarp, etc., of one of the mildews, Erysiphe: c, erect hyphae forming spores or conidia; h, haustoria penetrating epidermis of leaf; a, ascocarp or perithecium. plant having these substances. If this material is absent from the plant then it is immune and it has been shown in a few cases where individual plants were not subject to a plant disease that this was due to the lack of a substance which the infested plants had or to the presence of a new substance which was repellent to the parasite. The relation between parasite and host is strikingly brought out by Massee's experiment, in which he claims that a purely saprophytic fungus was induced to become a destructive parasite upon the leaves of a species of Begonia by injecting the leaves with a sugar solution. The fungus flourished upon the leaves treated in this way and produced spores. These spores were sown upon leaves similarly treated and this was repeated for. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
