. Studies in fossil botany . Paleobotany. CALAMOPITYEAE 481 through the secondary wood, and evidently belonged to the leaf-trace bundles. Their structure is typically mesarch ; in the large strands, approaching their exit,. Fig. 177.—Calaniopitysfascicularis. Transverse section of central part of stem, showing the pith (rather contracted), the primary xylem-strands, and part of the secondary .wood. A, large xylem-strand, about to pass out to a leaf; B, still larger strand, already on the way out ; fix, protoxylem-groups ; C (arrow), direction of another outgoing strand ; a, />, c, reparator
. Studies in fossil botany . Paleobotany. CALAMOPITYEAE 481 through the secondary wood, and evidently belonged to the leaf-trace bundles. Their structure is typically mesarch ; in the large strands, approaching their exit,. Fig. 177.—Calaniopitysfascicularis. Transverse section of central part of stem, showing the pith (rather contracted), the primary xylem-strands, and part of the secondary .wood. A, large xylem-strand, about to pass out to a leaf; B, still larger strand, already on the way out ; fix, protoxylem-groups ; C (arrow), direction of another outgoing strand ; a, />, c, reparatory strands of the bundles A, B, C. d, c, main and reparatory strands of two other leaf-traces, lower down in their course. x 20. Kidston Coll. 54oa. (G. T. G.) the protoxylem is central ; lower clown, as the strand diminishes in diameter, the centripetal wood becomes relatively reduced in amount. In the lower part of their course the xylem-strands become embedded in. 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 Scott, Dukinfield Henry, 1854-1934. London, A. and C. Black
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