. Plants; a text-book of botany. Botany. THE GREAT GROUPS OF ALG-E 4S 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 CHLOEOPHTLL-COXTAISrilJ'G THALLOPHTTES 34. Diatoms.—These are peculiar one-celled forms, which occur in very great abundance in fresh and salt Fig. 30. A gronp of Diatoms : c and d, top and side views of the same form; e, colony of stalked forms attaelied to an alga;/ and g, top and side views of the fo
. Plants; a text-book of botany. Botany. THE GREAT GROUPS OF ALG-E 4S 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 CHLOEOPHTLL-COXTAISrilJ'G THALLOPHTTES 34. Diatoms.—These are peculiar one-celled forms, which occur in very great abundance in fresh and salt Fig. 30. A gronp of Diatoms : c and d, top and side views of the same form; e, colony of stalked forms attaelied to an alga;/ and g, top and side views of the form shown at e; A, a colony; i. a colony, the top and side view shown at A-.—After Kerner. 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. 30).. 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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