. The British Charophyta. Characeae. 54 BRITISH CHAROPHYTA. the spiral-cells are abruptly narrowed on their inner sidej leaving a cavity (Fig. 23 i, ii). Below this the spiral-cells become tumid, leaving only a narrow channel between them, leading to a second cavity situated immediately above the oosphere (Fig., 23 ii). The upper part of the spiral-cells lengthens, forming a neck above the oosphere and under the coronula, in the process of which the outer layer of the cell- membrane splits transversely, leaving a jagged edge. Please note that these images are extracted from scanned page images
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. The British Charophyta. Characeae. 54 BRITISH CHAROPHYTA. the spiral-cells are abruptly narrowed on their inner sidej leaving a cavity (Fig. 23 i, ii). Below this the spiral-cells become tumid, leaving only a narrow channel between them, leading to a second cavity situated immediately above the oosphere (Fig., 23 ii). The upper part of the spiral-cells lengthens, forming a neck above the oosphere and under the coronula, in the process of which the outer layer of the cell- membrane splits transversely, leaving a jagged edge. 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 work.. Groves, James; Bullock-Webster, George Russell, 1858- joint author. London, The Ray society