. Botany of the living plant. Botany; Plants. 515 are microsporangia, containing main* mi< rospores. In form I sporangia arc alike; they differ in the number and size of their contents. A mature microsporangium, with its subtending sporophyU and ligule, is shown in median section in Fig. 407. The line of deh cence is distal, where the cells of the wall are smallest, and the. Fig. 406. Selaginella inaequaiifolia. A, fertile branch, half natural size. B, its tip in longitudinal section, and enlarged, with microsporangia to the left, and D sporangia to the right. (After
. Botany of the living plant. Botany; Plants. 515 are microsporangia, containing main* mi< rospores. In form I sporangia arc alike; they differ in the number and size of their contents. A mature microsporangium, with its subtending sporophyU and ligule, is shown in median section in Fig. 407. The line of deh cence is distal, where the cells of the wall are smallest, and the. Fig. 406. Selaginella inaequaiifolia. A, fertile branch, half natural size. B, its tip in longitudinal section, and enlarged, with microsporangia to the left, and D sporangia to the right. (After Sachs.) structure of the cells of the wall is such as to lead to its valves being everted as they dry on ripening, so that the spores are shed. The mature megasporangium behaves in a similar way, but the spores arc ejected forcibly by pressure of the everted valves upon them (Fig. 408). The spores fall upon the soil and germinate together. Thus both the megaspores and microspores are shed from the parent 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 Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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