. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. RELATION OF LEAF TO AXIS 197 formation of a regular stele: in which case the leaf-traces, represented in the first case by the protoxylem-strands, would be phylogenetically prior: the central metaxylem, on the other hand, would be a later formation, developed in the larger forms to furnish additional conducting channels to. Fie. 99 A forked sporangiferous branch of Lycofiodium chamcEcyparissTAS in longitudinal section, slightly magnified. ff= the axile vascular body. M = leaves. -« = young sporangia.
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. RELATION OF LEAF TO AXIS 197 formation of a regular stele: in which case the leaf-traces, represented in the first case by the protoxylem-strands, would be phylogenetically prior: the central metaxylem, on the other hand, would be a later formation, developed in the larger forms to furnish additional conducting channels to. Fie. 99 A forked sporangiferous branch of Lycofiodium chamcEcyparissTAS in longitudinal section, slightly magnified. ff= the axile vascular body. M = leaves. -« = young sporangia. supplement the protoxylems in supplying the needs of the higher foliage leaves and sporophylls. In approaching an opinion on such a question much will turn upon the initial relation of the leaf to the axis in the evolution of the leafy sporo- phyte, a matter already discussed in Chapter XI. If the leaf were from the first a preponderating influence in the shoot, then the latter explanation. 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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