. Essentials of botany. Botany; Botany. THE ALGiE 221 plasmolysis. It is an excellent illustration of osmosis and is easily demonstrated in many cells with thin walls and rather watery protoplasts. 381. Sexual Reproduction 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 of the process; B, the same filaments in a more advanced stage of spore-formation. The cells at a in each portion
. Essentials of botany. Botany; Botany. THE ALGiE 221 plasmolysis. It is an excellent illustration of osmosis and is easily demonstrated in many cells with thin walls and rather watery protoplasts. 381. Sexual Reproduction 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 of the process; B, the same filaments in a more advanced stage of spore-formation. The 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 disturbing the relative position of the filaments, and examine first with , then with Note: (a) Filaments lying paired, as in Fig. 155, B, connected by con- jugating tubes. (J) Filaments in which the tubes have not been fully formed but appear only as projections (Fig. 155, A, a). (c) The formation of ellipsoidal bodies, zygospores, by the union of the protoplasts of two conjugating cells. (d) Intermediate stages between cells in their ordinary condition and cells containing a single zygospore or entirely emptied of their 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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