. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. 4o ALTERNATING GENERATIONS that heterospory may occur without any essential change in the sporophyte; for the plant of Selaginella is of the general Lycopod type, with small-leaved, much-branched shoot rooted in the soil, B, megasporangium of Selaginella apus in median vertical section, showing three of the four megaspores. Xsi. A, a single megaspore, with prothallus and an archegonium, more highly magnified. (After Miss Lyon.) contiriued apical growth and terminal strobili. These are constr
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. 4o ALTERNATING GENERATIONS that heterospory may occur without any essential change in the sporophyte; for the plant of Selaginella is of the general Lycopod type, with small-leaved, much-branched shoot rooted in the soil, B, megasporangium of Selaginella apus in median vertical section, showing three of the four megaspores. Xsi. A, a single megaspore, with prothallus and an archegonium, more highly magnified. (After Miss Lyon.) contiriued apical growth and terminal strobili. These are constructed essentially upon the Lycopodinous plan, but instead of the sporangia, being all alike, some contain numerous small microspores, others contain. 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. London, Macmillan and Co. , Ltd.
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