. Studies in fossil botany . Paleobotany. 52 STUDIES IN FOSSIL BOTANY of which there are usually six, sometimes eight; generally they are in pairs, the two at each corner being more or less fused. On the inner side of the wood of each bundle we find a more or less regular canal (J>x in Fig. 19). If we examine a radial section we see the spiral protoxylem-elements in the canals : we have thus essentially the same structure as in. Fig. 19.—Calamostachys Binneyana. Transverse section of axis of cone, showing stele and part of cortex. Surrounding the pith there are six bundles, in groups of two
. Studies in fossil botany . Paleobotany. 52 STUDIES IN FOSSIL BOTANY of which there are usually six, sometimes eight; generally they are in pairs, the two at each corner being more or less fused. On the inner side of the wood of each bundle we find a more or less regular canal (J>x in Fig. 19). If we examine a radial section we see the spiral protoxylem-elements in the canals : we have thus essentially the same structure as in. Fig. 19.—Calamostachys Binneyana. Transverse section of axis of cone, showing stele and part of cortex. Surrounding the pith there are six bundles, in groups of two, with secondary wood, fix, protoxylem groups. X about 60. Phil. Trans. W. and S. Will. Coll. ior6. Catamites, for the vascular bundles are collateral here also, as shown by specially favourable preparations, in which the phloem can be recognised outside the wood ; in Calamostachys Binneyana, however, there is a solid pith, and the bundles are comparatively few. A very important point is, that in most of these fructifications we find distinct indications of secondary wood in the axis (Fig. 19). The bundles in Calamostachys do not alternate at. 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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