. Plants; a text-book of botany. Botany. BEYOPHYTES lUO is a single layer of sterile cells as a wall about the arche- sporium, which is composed of all the remaining cells of the upper half (Fig. 86, B). It will be noted that the sterile tissue in this sporogonium has encroached upon the arche- sporium, which is restricted to one half of the body. In this case the archesporium has the form of a hemisphere. In another liverwort {Jungermamna) the archesporium is still more restricted (Fig. 87). The sterile tissue is organ-. FlG. R7. Diagrammatic section of spo- Fig. 88. Section through fiporogon
. Plants; a text-book of botany. Botany. BEYOPHYTES lUO is a single layer of sterile cells as a wall about the arche- sporium, which is composed of all the remaining cells of the upper half (Fig. 86, B). It will be noted that the sterile tissue in this sporogonium has encroached upon the arche- sporium, which is restricted to one half of the body. In this case the archesporium has the form of a hemisphere. In another liverwort {Jungermamna) the archesporium is still more restricted (Fig. 87). The sterile tissue is organ-. FlG. R7. Diagrammatic section of spo- Fig. 88. Section through fiporogoninm ol rogonium of a JiiTtgermanma form, showing differentiation into foot, seta, and capsule, the arcliesporium restricted to upper part of sporogo- nium.—After GoEBEL. Sphagrnim, showing capsule (A') with old archegoniiim neck {ah), calyptra (ca), dome-shaped maps of sporogenous tissue (spo), and columella ico), also the bulb- ous foot i^f) imbedded in the pseudo- podium ip/-^ —After ScHiMPER. ized into a foot and a seta, and the archesporium is a com- paratively small mass of cells in the upper part of the sporogonium. In another liverwort (Anthnceros) the sterile tissue or- ganizes foot and seta, and the archesporium is still more restricted (Fig. 86, D). Instead of a solid hemispherical. 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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