. Fossil plants : for students of botany and geology . Paleobotany. XV] LEPIDODENDRON 163 immediately abut on the primary xylem; at p, p, the section passes through some of the projecting arms of the xylem cylinder; at vi is seen a patch of meristematic zone tissue. This section together with the similar section of Lepidoden- dron vasculare described on a previous page demonstrates that the projecting ridges of the primary xylem form apparently vertical bands: they are not characterised by a lattice-virork arrangement as described by Bertrand and by other authors who have accepted his conclusi
. Fossil plants : for students of botany and geology . Paleobotany. XV] LEPIDODENDRON 163 immediately abut on the primary xylem; at p, p, the section passes through some of the projecting arms of the xylem cylinder; at vi is seen a patch of meristematic zone tissue. This section together with the similar section of Lepidoden- dron vasculare described on a previous page demonstrates that the projecting ridges of the primary xylem form apparently vertical bands: they are not characterised by a lattice-virork arrangement as described by Bertrand and by other authors who have accepted his conclusions. If a reticulum of inter- secting ridges were present on the fiice of the xylem cylinder its existence would be revealed by such a section as that repre- sented in fig. 179, Fig. 180. Lepidodendron Wiinschianum. From Arran. (i nat. size.) (Sedgwick Museum, Cambridge.) 6. Lepidodendron Wiinschianum (Williamson). Figs. 180—184. Reference was made in Volume I. to the occurrence of large stems of a Lepidodendron in volcanic beds of Calciferous sand- stone age in the island of Arrant These were discovered and briefly described by Mr Wiinsch in 1807= and afterwards named by Carruthers Lomatophloyos Wunschianus\ Mr Carruthers 1 Volume I. p. 89. For other references to these stems, see Seward and Hill (00) p. 918. 2 Wunsch (67). ^ Carruthers (69=) 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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