. Fig. iT. — Protomyces macrosporus. Section through swollen leaf-stalk oi Aego- potUuni. Towards the right end the cells are normal, elsewhere they are, under the influence of the mycelium, much enlarged and secondarily divided ; two roundish sporangia lie in tliis tissue, (v. Tubeuf del.) appear as series of swellings on the hyphae and are easily detected in deformed plants as large thick-walled 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 ve
. Fig. iT. — Protomyces macrosporus. Section through swollen leaf-stalk oi Aego- potUuni. Towards the right end the cells are normal, elsewhere they are, under the influence of the mycelium, much enlarged and secondarily divided ; two roundish sporangia lie in tliis tissue, (v. Tubeuf del.) appear as series of swellings on the hyphae and are easily detected in deformed plants as large thick-walled 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. ' De Bary, Beitrciffe z. Morph. n. Physiol, d. Pike, also Botan. Zeitumj, 1874.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
