. Botany for high schools and colleges. Botany. CaSLOBLASTEjS!. 251 other objects, by root-like processes {w, Fig. 168). The protoplasmic contents of the tubes, which are destitute of a nucleus, consist of a thick green layer upon the inner sur- face of the wall, leaving the centre of the tubes open for the more watery portions. 335.—The asexual reproduction of Vaucheria presents some considerable variations; it consists essentially of a spontaneous separation of a portion of the protoplasm of the parent plant. In some species this takes place by the sepa-. Fjir ifis.— Vaucheria sessilis. ^, e
. Botany for high schools and colleges. Botany. CaSLOBLASTEjS!. 251 other objects, by root-like processes {w, Fig. 168). The protoplasmic contents of the tubes, which are destitute of a nucleus, consist of a thick green layer upon the inner sur- face of the wall, leaving the centre of the tubes open for the more watery portions. 335.—The asexual reproduction of Vaucheria presents some considerable variations; it consists essentially of a spontaneous separation of a portion of the protoplasm of the parent plant. In some species this takes place by the sepa-. Fjir ifis.— Vaucheria sessilis. ^, end of a branch, with escape of a zoospore, sp. B^ zoospore in its retting stage, after the disappearance of its cilia. C, the same, germi- nating. Z>, the same, further iiclviinced. E, much later stage of germination ; sp, the zoospore: w the root-likf processes irhizoids). F, fertile plant; og, og, oogonia fer- tilized ; h, an old antheridium. x 30 —After Sachs. ration of swollen lateral branches, which then send out fila- ments ; in other species the protoplasm in the swollen lateral branch becomes separated from that in the general cavity of the plant by a septum, and it afterward condenses into a rounded mass and acquires a wall of its own ; it is set free by the decomposition of the old surrounding wall, and it germinates by sending out one or two tubes, which gi-ow. 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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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1885
