. Fossil plants : for students of botany and geology . Paleobotany. ,^^p?'^)-. FiQ. 133. Isoetes lacustris. A. Transverse section of stem: cr, cortex; x, i^ xylem; c, cambium; a, thin-walled tissue; It, leai-traces; 6, dead tissue. B, C, D. Portions of A enlarged. E. Longitudinal radial section of sporophyll-base: v, velum; I, ligule ; bb, vascular bundle; m, megaspores; t, sterile tissue. F. Longitudinal section through the base of a root. G. Transverse section of root. H. Transverse section of sporophyll, showing sporangium with trabeculae, t; leaf-trace, (iJ), and two groups of secretory c

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. Fossil plants : for students of botany and geology . Paleobotany. , ^^p?'~^)-. FiQ. 133. Isoetes lacustris. A. Transverse section of stem: cr, cortex; x, i^ xylem; c, cambium; a, thin-walled tissue; It, leai-traces; 6, dead tissue. B, C, D. Portions of A enlarged. E. Longitudinal radial section of sporophyll-base: v, velum; I, ligule ; bb, vascular bundle; m, megaspores; t, sterile tissue. F. Longitudinal section through the base of a root. G. Transverse section of root. H. Transverse section of sporophyll, showing sporangium with trabeculae, t; leaf-trace, (iJ), and two groups of secretory cells. I. A group of secretory cells enlarged.. 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 work.. Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press