. Fossil plants : for students of botany and geology . Paleobotany. Fig. 91. A. Diagrammatic sketch of a transverse section of a young root of Galamites. x, xylem; I, lacuna. After Hick. B. Central cylinder (stele) of root, px, protoxylem; ph, phloem; x^, secondary xylem; I, phloeoterma. x 75. After Williamson and Scott. the figure secondary thickening has begun, and the cambial cells internal to each phloem group have given rise to a few radially disposed tracheids, x\ Beyond the phloem there are two layers of parenchyma representing, as regards position, a pericycle and an endodermis. In the
. Fossil plants : for students of botany and geology . Paleobotany. Fig. 91. A. Diagrammatic sketch of a transverse section of a young root of Galamites. x, xylem; I, lacuna. After Hick. B. Central cylinder (stele) of root, px, protoxylem; ph, phloem; x^, secondary xylem; I, phloeoterma. x 75. After Williamson and Scott. the figure secondary thickening has begun, and the cambial cells internal to each phloem group have given rise to a few radially disposed tracheids, x\ Beyond the phloem there are two layers of parenchyma representing, as regards position, a pericycle and an endodermis. In the ordinary pericycle and endodermis of the roots of most plants the cells of the two layers are on alternate radii, but in the Calamite root, as 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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