. Fossil plants : for students of botany and geology . Paleobotany. X] ARTHROBENDRON. 327 form of the principal medullary rays is seen in fig 83, G, and the rebiculate pitting on the radial wall of a tracheid is shown. Pig. 83. Calamites (Arthrodendron). A. Tangential section (diagrammatic) showing the course of the vas- cular strands, also leaf-traces and infranodal canals. B. Radial face of a tracheid. C. Prosenchymatous elements of a principal medullary ray. D. Transverse section of the wood. (After Williamson.) No. 36 in the Williamson Collection. in fig. 83, B. Fig. 83, A illustrates the
. Fossil plants : for students of botany and geology . Paleobotany. X] ARTHROBENDRON. 327 form of the principal medullary rays is seen in fig 83, G, and the rebiculate pitting on the radial wall of a tracheid is shown. Pig. 83. Calamites (Arthrodendron). A. Tangential section (diagrammatic) showing the course of the vas- cular strands, also leaf-traces and infranodal canals. B. Radial face of a tracheid. C. Prosenchymatous elements of a principal medullary ray. D. Transverse section of the wood. (After Williamson.) No. 36 in the Williamson Collection. in fig. 83, B. Fig. 83, A illustrates the large infranodal canals as seen in a tangential section of a stem. The same section shows also the course of the vascular bundles characteristic of Calamites as of Equisetum, and the position of outgoing leaf- traces is represented by unshaded areas in the black vascular strands. The subgenus Arthrodendron is very rarely met with, and our information as to this type is far from completed The third subgenus Calamodendron has not been discovered in English rocks, and our knowledge of this type is derived fi-om 1 Williamson and Scott (94), p. 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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