. The essentials of botany. Botany. PTERID0PH7TA. 207 genera the spores are of one kind; while in others they are of two kinds, large ones (macrospores) and small ones (microspores). 436. The first stage (prothallium) is but little known in the genera with one kind of spore only; it appears, how- ever, to be a thickish mass of tissue, which develops under-. Fio. 117.—Part of a Club-moss (Lycopodinm claTatum), the running, horizon- tal rooting stem below, with the spore-bearing cones, s, above. One half natm-al ground, and bears both kinds of sexual organs. In the genera with two kinds of spore
. The essentials of botany. Botany. PTERID0PH7TA. 207 genera the spores are of one kind; while in others they are of two kinds, large ones (macrospores) and small ones (microspores). 436. The first stage (prothallium) is but little known in the genera with one kind of spore only; it appears, how- ever, to be a thickish mass of tissue, which develops under-. Fio. 117.—Part of a Club-moss (Lycopodinm claTatum), the running, horizon- tal rooting stem below, with the spore-bearing cones, s, above. One half natm-al ground, and bears both kinds of sexual organs. In the genera with two kinds of spores, the macrospores produce small cellular growths, which project slightly through the ruptured spore-wall, and upon these several or many arche- gones are formed; the microspores produce very small, few- 'celled growths, each of which bears a single antherid, in which there are developed a few 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. Holt and company, ;
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