. Studies in fossil botany . Paleobotany. 3o8 STUDIES IN FOSSIL BOTANY wood, as shown in successive transverse sections, it follows that the angle of divergence between two successive leaves was in this case j? (Fig. 116, I-S)- A short xylem-arm from which the leaf-trace has just separated appears merely as a slight bulge (Fig. i 16, i) ;. -ax. Fin. 115—Zygojttcris Grayi. Transverse section of stem, with axillary shoot and part of petiole. In the middle of the stent the five-angled stele is seen (cf. Fig. 116). /. t., leaf-trace, about to give off the axillary strand ; ., " scale-leaf
. Studies in fossil botany . Paleobotany. 3o8 STUDIES IN FOSSIL BOTANY wood, as shown in successive transverse sections, it follows that the angle of divergence between two successive leaves was in this case j? (Fig. 116, I-S)- A short xylem-arm from which the leaf-trace has just separated appears merely as a slight bulge (Fig. i 16, i) ;. -ax. Fin. 115—Zygojttcris Grayi. Transverse section of stem, with axillary shoot and part of petiole. In the middle of the stent the five-angled stele is seen (cf. Fig. 116). /. t., leaf-trace, about to give off the axillary strand ; ., " scale-leaf" ; ax., axillary shoot of next node below ; pet., part of petiole of the subtending leaf. The small strand in the cortex to the right belongs to a scale-leaf. X about 4. From a photograph by Mr. L. A. Boodle. Will. Coll. iqiq A. those of successively greater length assume a truncated form at the end (Fig. 116, 2, 3, and 4); while the longest arms of all spread out laterally, so as to be broadest at their termination, acquiring a bicornute out- line (Fig. 116, 5). It is the enlarged end of the arm which, at a somewhat higher level, becomes detached, to. 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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