. Studies in fossil botany . Paleobotany. 3o2 STUDIES IN FOSSIL BOTANY zoic stem. The phloem, with its large sieve-tubes, is well- shown in good specimens on both sides of the wood, and the protoxylem can be recognised, forming a number of small groups on the inner edge of the xylem, which is thus endarch (Fig. 114). Its position in the. Fig. 114.—Psaronius Renaulti. Part of transverse section of stem, showing a portion of the solenostele. On the left is the edge of a leaf-gap. In the stele, note the protoxylem-groups on the inner edge of the wood. The phloem, with large sieve- tubes, is well
. Studies in fossil botany . Paleobotany. 3o2 STUDIES IN FOSSIL BOTANY zoic stem. The phloem, with its large sieve-tubes, is well- shown in good specimens on both sides of the wood, and the protoxylem can be recognised, forming a number of small groups on the inner edge of the xylem, which is thus endarch (Fig. 114). Its position in the. Fig. 114.—Psaronius Renaulti. Part of transverse section of stem, showing a portion of the solenostele. On the left is the edge of a leaf-gap. In the stele, note the protoxylem-groups on the inner edge of the wood. The phloem, with large sieve- tubes, is well preserved on the outer side. The dark elements in the pericycle are secretory sacs. X r3. S. Coll. 2174. From a photograph by Mr. Tams. numerous steles of the more complex species may be similar, but requires further investigation. P. Renaulti may provisionally be regarded as the most primitive member of the genus. In a specimen probably referable to this species Mr. Butterworth made the interesting discovery that some of the roots show a. 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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