. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 140 ASCOMYCETES. cell-nucleus. This tissue so formed may be compared to the nutritive tissue formed secondarily from parenchyma as a result of other fungoid diseases, in violas attacked by Urocystis violae. If the formation of sporangia ensues in parts which would normally become collenchyma, the tissues there remain thin-walled. The sporangia of Protomyces, according to De Bary,^ begin to develop as soon as th
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 140 ASCOMYCETES. cell-nucleus. This tissue so formed may be compared to the nutritive tissue formed secondarily from parenchyma as a result of other fungoid diseases, in violas attacked by Urocystis violae. If the formation of sporangia ensues in parts which would normally become collenchyma, the tissues there remain thin-walled. The sporangia of Protomyces, according to De Bary,^ begin to develop as soon as the young leaves and shoots of the host- plants emerge above the ground in spring. The sporangia first. âProtomyces niacrosporus. Section through swollen leaf-stalk ot Aego- poditim. Towards the light end the cells are normal, elsewhere they are, under the influence of the mycelium, much enlarged and secondarily divided; two roundish sporangia lie in this tissue, (v. Tubeuf del.) appear as series of swellings on the hyphae and are easily detected in deformed plants as large thick-waUed bodies lying in the intercellular spaces. They are liberated on decay of the host-plant, and in spring the contents swell up so as to rupture the thick outer wall, and the endosporium emerges as a vesicle or sporangium into which the protoplasmic contents pass to form numerous rod-shaped spores. The spores are ultimately expelled with considerable force, and, after conjugating in couples, they send forth a germ-tube which penetrates again into the tissues of the host-plant. â â De Bary, Beitrage %. Morph. u. Physiol, d. Pitze, also Botan. Zeitang, 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
