. The British Charophyta. Characeae. STEUCTURE AND DEVELOPMENT. 45 the antheridia and oogonia are produced together on the inner side of the branchlets from one outgrowth arising from the central anterior peripheral cell of the branchlet-node taking the place of a bract-celL In Lamp-othamnium the oogonium is produced below or occasionally by the side of the antheridium (Fig. 16 iv A and B), in Char a the antheridium is produced below the oogonium (Fig. 17). Both oogonia and anthe-. Fio. 17.—Position of reproductive organs in Chara fragilis (after Strasburger) (x o. 45). Vertical section of bra
. The British Charophyta. Characeae. STEUCTURE AND DEVELOPMENT. 45 the antheridia and oogonia are produced together on the inner side of the branchlets from one outgrowth arising from the central anterior peripheral cell of the branchlet-node taking the place of a bract-celL In Lamp-othamnium the oogonium is produced below or occasionally by the side of the antheridium (Fig. 16 iv A and B), in Char a the antheridium is produced below the oogonium (Fig. 17). Both oogonia and anthe-. Fio. 17.—Position of reproductive organs in Chara fragilis (after Strasburger) (x o. 45). Vertical section of branchlet-node and reproductive organs, n, central cell of node ; i, internodal cells; hn, basal nodal cell; /, flask-cell of antheridivim; p, peripheral cells; c, cortical cells ; os, stalk-cell of oogonium; 6c, bract-cell. ridia in these genera are almost always practically sessile, but instances occur occasionally in which the- stalk-cell of one or other is elongated. The origin of the reproductive organs will be best seen in Fig. 17. The oogonium is borne on a stalk- cell OS, and this, as well as the flask-cell of the antheridium, arise from the cell bn called the basal- node-cell. The order of development and the arrange-. 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 Groves, James; Bullock-Webster, George Russell, 1858- joint author. London, The Ray society
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