. Fossil plants : for students of botany and geology . Paleobotany. Fig. 105. Sphenophyllum. A. Transverse section of young stem. B. Transverse section of the wood of a young stem; px, protoxylem; a;, secondary xylem. (4 and B. Sphenophyllumplurifoliatum.) x 20. C. Transverse section of an old stem ; {S. insigne); a, phloem; b, peri- derm ; c, fascicular secondary xylem; d, interfascicular secondary xylem. x 9. (No. 914 in the Williamson Collection.) D. Longitudinal section of the reticulate tracheae and medullary rays; r, r, r, of S. plurifoliatum. x 36. E. Similar section of S. insigne. x75.

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. Fossil plants : for students of botany and geology . Paleobotany. Fig. 105. Sphenophyllum. A. Transverse section of young stem. B. Transverse section of the wood of a young stem; px, protoxylem; a;, secondary xylem. (4 and B. Sphenophyllumplurifoliatum.) x 20. C. Transverse section of an old stem ; {S. insigne); a, phloem; b, peri- derm ; c, fascicular secondary xylem; d, interfascicular secondary xylem. x 9. (No. 914 in the Williamson Collection.) D. Longitudinal section of the reticulate tracheae and medullary rays; r, r, r, of S. plurifoliatum. x 36. E. Similar section of S. insigne. x75. (D and E after Williamson and Scott.). 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press

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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898