. The Characeae of America. FiS- 37- DEVELOPMENT OF THE ANTHERIDIUM.—The cell which is to produce the Antheridium divides horizontally (to the axis) into a disk-shaped basal cell and a terminal cell which finally becomes nearly spherical, flattened only at the base, where it rests upon the stipe cell. The stipe cell is usually quite short, but occasionally (as in Tolypella stip- itata) it is considerably elongated. The terminal cell now di- vides into four, then into eight cells. These eight cells occupy the whole circumfer- ence of the sphere; they now di- vide internally parallel to the surf
. The Characeae of America. FiS- 37- DEVELOPMENT OF THE ANTHERIDIUM.—The cell which is to produce the Antheridium divides horizontally (to the axis) into a disk-shaped basal cell and a terminal cell which finally becomes nearly spherical, flattened only at the base, where it rests upon the stipe cell. The stipe cell is usually quite short, but occasionally (as in Tolypella stip- itata) it is considerably elongated. The terminal cell now di- vides into four, then into eight cells. These eight cells occupy the whole circumfer- ence of the sphere; they now di- vide internally parallel to the surface in such a way that three sets, each of eight cells, form one within the other— Fig. 38, "; These twenty- four cells are thus arranged in eight radii and form three spheres one within the other. Fig. 38. The superficial cells differ somewhat in shape ; those about the free apex of the sphere come to a point and are triangular in shape, see Fig. 39, "A," while those at the base having the points downward are truncated ; all are arched on the surface to make the sphere and. 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 Allen, Timothy Field, 1837-1902. New York : [s. n. ]
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