. Studies in fossil botany . Paleobotany. PSARONIUS 299 development. The question, however, deserves further investigation. In the central region of the stem we see at once that the vascular system is remarkably complex, con- sisting of a great number of regularly disposed steles,. Fig. 113.—Psaj-ouiits brasiliensis. Transverse section of stem. The whole of the central portion, containing the vascular bundles, is shown, together with a great part of the cortex, traversed by innumerable adventitious roots. Fi, F2, leaf-gaps. For detailed description, see text. The round objects at o are acciden
. Studies in fossil botany . Paleobotany. PSARONIUS 299 development. The question, however, deserves further investigation. In the central region of the stem we see at once that the vascular system is remarkably complex, con- sisting of a great number of regularly disposed steles,. Fig. 113.—Psaj-ouiits brasiliensis. Transverse section of stem. The whole of the central portion, containing the vascular bundles, is shown, together with a great part of the cortex, traversed by innumerable adventitious roots. Fi, F2, leaf-gaps. For detailed description, see text. The round objects at o are accidental perforations. Reduced. After Zeiller. usually much elongated in transverse section, but varying greatly in size and form. At two opposite points (Fig. 113, Fi and F2) outgoing leaf-traces are shown. The leaves appear to have been decussately arranged, but those of the same pair were not precisely at the same level. At F2 the open curve of the out-. 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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