. Studies in fossil botany . Paleobotany. THE STEM OF CALAMITES 25 far as anatomy goes, is simply an Equisetum with secondary thickening. In order to carry the comparison further, we must settle one or two points, especially the course of the vascular bundles. In Equisetum itself their course is exceedingly simple: a single vascular bundle enters the stem from each leaf, and. Fig. 7.—Calamitcs, sp. Radial section of a decorticated stem, with fairly thick wood, showing the fistular pith, crossed by diaphragms at the nodes. X 9. From a photo- graph. Phil. Trans., W. and S. Will. Coll. 1937. pass
. Studies in fossil botany . Paleobotany. THE STEM OF CALAMITES 25 far as anatomy goes, is simply an Equisetum with secondary thickening. In order to carry the comparison further, we must settle one or two points, especially the course of the vascular bundles. In Equisetum itself their course is exceedingly simple: a single vascular bundle enters the stem from each leaf, and. Fig. 7.—Calamitcs, sp. Radial section of a decorticated stem, with fairly thick wood, showing the fistular pith, crossed by diaphragms at the nodes. X 9. From a photo- graph. Phil. Trans., W. and S. Will. Coll. 1937. passes straight down through one internode only. At the node next below, the bundle forks, and its branches attach themselves to the adjacent alternating vascular bundles passing out at that node. This type is often deposits, named provisionally C. petty curensis, groups of centripetally developed wood are present on the inner side of the canals. This is a point of interest, as tending to connect the Calamarieae with the Spheno- phyllales, in which the primary wood is centripetal (see pp. 36 and 89).. 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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