. Botany of the living plant. Botany; Plants. PHYCOMYCETES— (a) OOMYCETES 403 granular protoplasm which contains numerous nucl The threads traverse the cell-walls of the host with the greatest case (Fig. 301), while collapse of the cells and loss of mechanical firmness lead to the falling over of the diseased plant. Left to itself in moist air the disease may spread from plant to plant, the hyphae passing out from the tissues and forming cottony growths through the damp air : they. Fig. 301. Small portion of cellular tissue of a Potato, showing the passage of the hyphae of Pythium through the
. Botany of the living plant. Botany; Plants. PHYCOMYCETES— (a) OOMYCETES 403 granular protoplasm which contains numerous nucl The threads traverse the cell-walls of the host with the greatest case (Fig. 301), while collapse of the cells and loss of mechanical firmness lead to the falling over of the diseased plant. Left to itself in moist air the disease may spread from plant to plant, the hyphae passing out from the tissues and forming cottony growths through the damp air : they. Fig. 301. Small portion of cellular tissue of a Potato, showing the passage of the hyphae of Pythium through the cell-walls at b. At a, hyphae are seen in an inter-cellular space, one of which has then entered the large cell. Highly magnified. (After Marshall Ward.) are coarse enough to be seen with the naked eye. The affected seed- lings soon become a putrid mass of decay. The fungus that causes the trouble is Pythium debaryamim, which belongs to the large family of the Peronosporales. Most of these plants live actually in water, and cause decay in submerged plant- and animal-matter. One of them, Achlya, appears with a high degree of certainty on dead flies, if left floating in foul water. Pythium propagates both vegetatively and sexually. The vegeta- tive propagation is by sporangia (Fig. 302, c), formed usually from the ends of the hyphae, by their swelling to an oval form. They con-. 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 Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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Keywords: ., bookcentury1900, bookpublis, booksubjectbotany, booksubjectplants
