. Contributions from the Hull Botanical Laboratory. Plants. 1015] AASE—MEGASPOROPHYLLS OF CONIFERS 301 Araucarla, is absent, but the general appearance of a slight eleva- tion behind the ovule suggests the possibility of a fused body. The vascular supply begins as a single stout trace a little to one side at the base of the short wide cylinder gap. The trace increases in size, and in the outer one-third of the cortex a branching begins which in the lamina of the scale results in about thirteen bundles. About half-way between the insertion of the sporophyll and the insertion of the ovule a smal
. Contributions from the Hull Botanical Laboratory. Plants. 1015] AASE—MEGASPOROPHYLLS OF CONIFERS 301 Araucarla, is absent, but the general appearance of a slight eleva- tion behind the ovule suggests the possibility of a fused body. The vascular supply begins as a single stout trace a little to one side at the base of the short wide cylinder gap. The trace increases in size, and in the outer one-third of the cortex a branching begins which in the lamina of the scale results in about thirteen bundles. About half-way between the insertion of the sporophyll and the insertion of the ovule a small strand splits off from one of the median bundles, swings around 1S00, and becomes an inverted bundle. Figs. 155-161.—Araucaria Rulci, young sporophyll: figs. 155-160, course of bundles from strobilus axis to free portion of bract, upper bundles differentiated in cortex and base of sporophyll (B, bract; 5, scale; 0, ovule); fig. 161, longitudinal section of sporophyll; opposite its sister bundle. The inverted strand may fork, and also inverted strands may spring from several of the median lower bundles and these strands may divide so that the number of upper bundles varies from one to several. In any case, each of the upper bundles, after giving off a phloem-like strand to each ovule, ends in large irregular tracheids. PODOCARPINEAE In most of the Podocarpineae a definite strobilus is absent, the fructification consisting in most cases of one or two fertile sporo- phylls. In many forms there is a tendency for some part of the fructification to mature 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 Hull Botanical Laboratory. [Chicago : University of Chicago Press
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1895
