. Studies in fossil botany . Paleobotany. 43 2 STUDIES IN FOSSIL BOTANY structure with normal secondary growth of the individual stele. This is the great anatomical character of the genus Medullosa, with its immediate allies, and separates them at once from all plants now living, though there. Fig. 165.—Merfullosa ang-lica. Part of transverse section, showing portions of two steles, and leaf-traces going off from them, x, primary wood of steles ; x"-, secondary wood ; ph, phloem ; It, leaf-trace, just detached from its stele ; , large leaf-trace, beginning to divide. Other smaller bun
. Studies in fossil botany . Paleobotany. 43 2 STUDIES IN FOSSIL BOTANY structure with normal secondary growth of the individual stele. This is the great anatomical character of the genus Medullosa, with its immediate allies, and separates them at once from all plants now living, though there. Fig. 165.—Merfullosa ang-lica. Part of transverse section, showing portions of two steles, and leaf-traces going off from them, x, primary wood of steles ; x"-, secondary wood ; ph, phloem ; It, leaf-trace, just detached from its stele ; , large leaf-trace, beginning to divide. Other smaller bundles are shown, x 10. Phil. Trans., S. From a photograph. S. Coll. 579. is one other fossil family (that of the Cladoxyleae) which shares the peculiarity (see p. 496.) The secondary wood has the same structure as in Heterangium or Lyginodendron (see Fig. 165). The tracheides, which are in radial series, accompanied by muriform medullary rays, are, as a rule, pitted on their radial walls only The pits are multiseriate and. 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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