. Plants; a text-book of botany. Botany. loi PLANT STEUCTUEES ous part of the higher plants. The " fern plant," and the herhs, shrubs, and trees among " flowering plants" correspond to the sporogonium of Bryophytes, and not to the leafy branch (gametophore) or "moss plant." Conse- quently the evolution of the sporogonium through the Bryophytes is traced with a great deal of interest. It may be outlined as follows : In a liverwort called Riccia the simplest sporogonium is found. It is a globular capsule, without seta or foot. Fig. 86, Diagrammatic sections of eporo
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. Plants; a text-book of botany. Botany. loi PLANT STEUCTUEES ous part of the higher plants. The " fern plant, " and the herhs, shrubs, and trees among " flowering plants" correspond to the sporogonium of Bryophytes, and not to the leafy branch (gametophore) or "moss plant." Conse- quently the evolution of the sporogonium through the Bryophytes is traced with a great deal of interest. It may be outlined as follows : In a liverwort called Riccia the simplest sporogonium is found. It is a globular capsule, without seta or foot. Fig. 86, Diagrammatic sections of eporogonia of liverworts: A, Jiiccia, the whole capsule being archesporium except the eterile wall layer ; B, Marrhanda, one half the cai)sule being sterile, the archesporium restricted to the other half; D, AntJioceros, archesporium still more restricted, being dome-shaped and capping a central sterile tissue, the columella {col).—After Goeeel. (Fig. 86, A). The only sterile tissue is the single layer of cells forming the wall, all the cells within the wall be- longing to the archesporium. The ripe sporogonium, therefore, is nothing but a thin-walled spore case. It is well to note that the sporophyte thus begins as a spore case, and that any additional structures that it may de- velop later are secondary. In another liverwort {MdrrJuiiifin) the entire lower half of the sporogonium is sterile, while in the upper half there. 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.. Coulter, John Merle, 1851-1928. New York, D. Appleton and company