. Botany of the living plant. Botany. 414 BOTANY OF THE LIVING PLANT granular protoplasm. The threads traverse the cell-walls of the host with the greatest ease, while collapse of the cells and loss of mechanical firmness lead to the falling over of the diseased plant (Fig. 349). 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 arc coarse enough to be. Fig. 349. Small portion of cellular tissue of a Potato, showing the passage of the hyphae of Pythiiiui through the cell-walls a
. Botany of the living plant. Botany. 414 BOTANY OF THE LIVING PLANT granular protoplasm. The threads traverse the cell-walls of the host with the greatest ease, while collapse of the cells and loss of mechanical firmness lead to the falling over of the diseased plant (Fig. 349). 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 arc coarse enough to be. Fig. 349. Small portion of cellular tissue of a Potato, showing the passage of the hyphae of Pythiiiui through the cell-walls at h. At a, hyphae are seen in an inter-cellulax space, one of which has then entered the large cell. Highly magnified. (After Marshall Ward.) seen with the naked eye. The affected seedlings soon become a putrid mass of decay. The fungus that causes the trouble is Pythimn deharyaniim, which belongs to the large family of the Saprolegnieae. Most of these plants live actually in water, and cause decay in submerged plant- and animal-matter. One of them, Aclilyn, appears with a high degree of certainty on dead flics, if left floating in foul water. Pylkuim propagates both vegetatively and sexually. The vegeta- tive propagation is by sporangia (Fig. 350, c) formed usually from the. 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. London, Macmillan and co. , limited
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
