. The essentials of botany. Botany. —Slio-wmgtips of two conidiophores of Potato-mildew (Phytoph- thora infestans). Highly magnified. under the epidermis and rupture it. Here the conidia are borne in chains or bead-like rows (Fig. 82). 274. In some species the conidia germi- nate by forming a tube; in others they divide internally and finally emit many zoospores. The latter eventually pro- trude a tube and bore their way into the cells of the host (Fig. 83, a to i). 275. The sexual reproduction always takes place in the intercellular spaces of the host. Lateral branches of two kinds app
. The essentials of botany. Botany. —Slio-wmgtips of two conidiophores of Potato-mildew (Phytoph- thora infestans). Highly magnified. under the epidermis and rupture it. Here the conidia are borne in chains or bead-like rows (Fig. 82). 274. In some species the conidia germi- nate by forming a tube; in others they divide internally and finally emit many zoospores. The latter eventually pro- trude a tube and bore their way into the cells of the host (Fig. 83, a to i). 275. The sexual reproduction always takes place in the intercellular spaces of the host. Lateral branches of two kinds appear upon the hyphse; those of one kind.(the young oogones) become greatly thickened and finally assume a globular shape (Fig. 84, o); the other branches (the young antherids) become elongated and club-shaped (Fig. 84, n). The antherids bend and come in contact with the oogones, and soon each thrusts out a small tube which penetrates the ofigone, reaching the. Fig. 82.—Showing conidiophores and conidia of the White Rust of Pe^- pergrass. Magni- fied 400 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : Holt
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1896
