. Microbes, ferments and moulds . Bacteria; Fungi; Fermentation. 36 MICROBES, FERMENTS, AND MOULDS. oidium. Brown patches appear on the upper surface of the leaf, as if it had been scorched; and in corre- spondence with these there is a delicate down " like the whiteness of a slight hoar-frost" (Vaissier) on its lower surface. The hyphse issuing from the mycelium ramify at right angles, and these branches bear the spores, as in the potato-fungus, Peronospora infestans (Figs. 17,18). These numerous spores, diffused through the air, are powerful sources of Fig. 17.—Mildew •
. Microbes, ferments and moulds . Bacteria; Fungi; Fermentation. 36 MICROBES, FERMENTS, AND MOULDS. oidium. Brown patches appear on the upper surface of the leaf, as if it had been scorched; and in corre- spondence with these there is a delicate down " like the whiteness of a slight hoar-frost" (Vaissier) on its lower surface. The hyphse issuing from the mycelium ramify at right angles, and these branches bear the spores, as in the potato-fungus, Peronospora infestans (Figs. 17,18). These numerous spores, diffused through the air, are powerful sources of Fig. 17.—Mildew • a, vertical section of a leaf, bearing tufts of Peronospora viticola on its lower surface; 6, a withered leaf, bearing the winter spores (oospores) (X 20 diam.). This parasite destroys the tissue of the leaf, exhausts it, and finally causes it to wither and fall. Those which are least affected have only diseased patches. The bunch of grapes and the young herbaceous shoots are rarely affected. In addition to the ordinary or summer spores of which we have spoken, the sexual spores must be noted; the oospores, or dormant winter spores, which. 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 Trouessart, E. -L. (Edouard-Louis), 1842-1927. New York : Appleton
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectfungi, bookyear1890
