. Essentials of botany. Botany; Botany. THE 221 plasmolysis. It is an excellent illustration of osmosis and is easily- demonstrated in many cells with thin walls and rather watery protoplasts. 281. Sexual Eeproduction of Spirogyra. — Cut off with the dissect- ing scissors very small portions of material from the yellowish uneven filaments of Spirogyra which are often found clinging Fig. 155. Conjugating Filaments of Spirogyra. (Considerably magnified.) A, beginning o£ the process; B, the same filaments in a more advanced stage of spore-formation. Tlie cells at a in each portio
. Essentials of botany. Botany; Botany. THE 221 plasmolysis. It is an excellent illustration of osmosis and is easily- demonstrated in many cells with thin walls and rather watery protoplasts. 281. Sexual Eeproduction of Spirogyra. — Cut off with the dissect- ing scissors very small portions of material from the yellowish uneven filaments of Spirogyra which are often found clinging Fig. 155. Conjugating Filaments of Spirogyra. (Considerably magnified.) A, beginning o£ the process; B, the same filaments in a more advanced stage of spore-formation. Tlie cells at a in each portion of the figure are at an earlier stage of conjugation than those at 6. n, nucleus; c, chloroplast. Mount in a little water, without distui"bing the relative iiosition of the filaments, and examine first with , then with Xote: (n) Filaments lying paired, as in Fig. , B, connected by con- j'ugatinff tubes. (J) Filaments in which the tubes have not been fully formed but appear only as projections (Fig. 155, A, a). ((•) The formation of ellipsoidal bodies, zygospores, by the union of the protoplasts of two conjugating cells. (rf) Intermediate stages between cells in their ordinary condition and cells containing a single zygospore or entirely emptied of theii 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 Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn
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