. Plant studies; an elementary botany. Botany. THE GREAT GROUPS OF ALG^E 261 fore, two sorts of asexual spores are produced: (1) the • tetraspores, developed in ordinary sporangia; and (2) the carpospores, developed in the cystocarp, which has been produced as the result of fertilization. OTHER CHLOROPHYLL-CONTAINING THALLOPHYTES 175. Diatoms.—These are peculiar one-celled forms, which occur in very great abundance in fresh and salt Fig. 230. A group of Diatoms : c and d, top and side views of the same form; e, colony of stalked forms attached to an alga;/ and g, top and side views of
. Plant studies; an elementary botany. Botany. THE GREAT GROUPS OF ALG^E 261 fore, two sorts of asexual spores are produced: (1) the • tetraspores, developed in ordinary sporangia; and (2) the carpospores, developed in the cystocarp, which has been produced as the result of fertilization. OTHER CHLOROPHYLL-CONTAINING THALLOPHYTES 175. Diatoms.—These are peculiar one-celled forms, which occur in very great abundance in fresh and salt Fig. 230. A group of Diatoms : c and d, top and side views of the same form; e, colony of stalked forms attached to an alga;/ and g, top and side views of the form shown at e; h, a colony; i, a colony, the top and side view shown at k.—After Kernek. They are either free-swimming or attached by gelatinous stalks; solitary, or connected in bands or chains, or im- bedded in gelatinous tubes or masses. In form they are rod-shaped, boat-shaped, elliptical, wedge-shaped, straight or curved (Fig. 230).. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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