. Studies in fossil botany . Paleobotany. LYGINODENDRON 369 spinous outgrowths, just as the young parts of recent Ferns are covered with the ramenta. In addition to the spines, glandular outgrowths, apparently homologous with them, also occur, and in some forms of the plant are extremely abundant on stem, rachis, and leaflets. These organs, as we shall Lt Li mm. Fig. 135.—Lyginodendron oldkamimti. Transverse section of a very young stem, at the commencement of secondary growth, x, one of the six primary xylem - strands surrounding the pith, which is not preserved ; .r-, narrow zone of secondar
. Studies in fossil botany . Paleobotany. LYGINODENDRON 369 spinous outgrowths, just as the young parts of recent Ferns are covered with the ramenta. In addition to the spines, glandular outgrowths, apparently homologous with them, also occur, and in some forms of the plant are extremely abundant on stem, rachis, and leaflets. These organs, as we shall Lt Li mm. Fig. 135.—Lyginodendron oldkamimti. Transverse section of a very young stem, at the commencement of secondary growth, x, one of the six primary xylem - strands surrounding the pith, which is not preserved ; .r-, narrow zone of secondary wood ; , leaf-trace bundles; c, outer cortex; pet, hase of petiole. x n. Will. Coll. 1144 D. (G. T. G.) see, have played an even more important part than the spines in the advancement of our knowledge of the plant, for it was by means of the glands that the seeds of Lyginodendron were first identified (see p. 388). The glands are sometimes sessile, but more usually rested on a stout multicellular stalk, the actual gland consisting of a more or less spherical head, which is. 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
Size: 1661px × 1503px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondonaandcblack
