. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PUCCINIA. 343 hyphae forming the bottom of the aecidium-cup. These hyphae give rise to numerous short sporophores, from each of which a single long chain of spores is abjointed in basipetal succession, the spores being at first separated by temporary intermediate cells. The sporophores round the margin of each aecidium do not, however, give off spores; they also produce chains of cells basipetally, but these grow la
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PUCCINIA. 343 hyphae forming the bottom of the aecidium-cup. These hyphae give rise to numerous short sporophores, from each of which a single long chain of spores is abjointed in basipetal succession, the spores being at first separated by temporary intermediate cells. The sporophores round the margin of each aecidium do not, however, give off spores; they also produce chains of cells basipetally, but these grow larger and, without the inter- vention of intermediate cells, remain sterile and become joined. Fig. 183.—Puccinia graminis (Aecidium berberidis) on Berberis communis. The lowest leaf and two others are seen on the upper surface, and show red spots with light margins, in which the pycnidia are embedded. The other le'aves show the under surface with patches of aecidia. (v. Tubeuf del) to their neighbours to form the peridium. Diseased portions of leaves become considerably thickened. The cells of the single layer of palisade parenchyma are abnormally elongated, and the intercellular spaces of the spongy parenchyma, instead of being large, are small and filled with mycelium. The aecidio- spores escape in July to germinate on Gramineae. The germ- tube enters the host by the stomata only, and develops into an intercellular mycelium; this in about eight days produces uredospores from cushions or sori which form lines, and break. 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 Tubeuf, Karl, freiherr von, 1862-1941; Smith, William G. London ; New York [etc. ] : Longmans, Green & co.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
