. Botany for high schools and colleges. Botany. Fig. 178.—Tlie sexual organs and fertilization of Pei'onospora Atsinearum. a, youngest stage ; o, young oogonium ; n, young antheridium ; b, the same somewhat later ; the antheridium is beginning to thrust its beak-like process (fertilizing tube) into the oogonium ; o, the same at a still later stage—the fertilizing tube has reached the oosphere. X 350.—Alter DeBary. in diameter, and finally assume a globular shape; their highly granular protoplasm becomes condensed, and finally separated from that of the remainder of the filament by a transverse
. Botany for high schools and colleges. Botany. Fig. 178.—Tlie sexual organs and fertilization of Pei'onospora Atsinearum. a, youngest stage ; o, young oogonium ; n, young antheridium ; b, the same somewhat later ; the antheridium is beginning to thrust its beak-like process (fertilizing tube) into the oogonium ; o, the same at a still later stage—the fertilizing tube has reached the oosphere. X 350.—Alter DeBary. in diameter, and finally assume a globular shape; their highly granular protoplasm becomes condensed, and finally separated from that of the remainder of the filament by a transverse septum at the base of each oogonium {a, Pig. 178). The other branches, the young anthe- ridia, which arise upon the same fila- ments as the oogonia and near to them, or apon other filaments which are in proximity to the oogonia-bear- ing ones, become elongated and club- shaped ; their protoplasm (also gran- ular) becomes condensed in their up- per portions, which are soon separated from the rest of the filament by a transverse partition in each case (a, Fig. 178). At this stage the an- theridia become applied to the oogonia, and in each of the latter the protoplasm has still further condensed and * Consult De Bary's " Morphologie und Pbysiolofrie der Pilze," etc., pp. 158-159, a translfttion of wbicli appeared in " Qrevillea," 1873, p, 150,. Fig 179.—Oogonium of Pe- rono'-pora, with, its contained oosphere; at the left is the antheridinm, which has pene- trated the ooeoniuiu and brought its fertilizing tube - into contact with the oo- sphere. Much magnified.— After De 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 : H. Holt
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