. Fossil plants : for students of botany and geology . Paleobotany. 378 BENNETTITALBS [CH. steles similar to those in Gycas occasionally occur (fig. 511). The large pith consists of parenchyma and secretory canals, and internal periderm^ may be present; no medullary bundles have been Rg. 512. Gycadeoidea ingens. Transverse section of a, young frond, above the tip of the rachis, embedded in ramenta. The rachis is situated on the upper side of the two ranks of pinnae. The arrow points towards the axis of the stem. (After Wieland; x 4.) The correlation of the numerous fronds^ preserv
. Fossil plants : for students of botany and geology . Paleobotany. 378 BENNETTITALBS [CH. steles similar to those in Gycas occasionally occur (fig. 511). The large pith consists of parenchyma and secretory canals, and internal periderm^ may be present; no medullary bundles have been Rg. 512. Gycadeoidea ingens. Transverse section of a, young frond, above the tip of the rachis, embedded in ramenta. The rachis is situated on the upper side of the two ranks of pinnae. The arrow points towards the axis of the stem. (After Wieland; x 4.) The correlation of the numerous fronds^ preserved in Meso- zoic strata with their parent-stems is seldom possible. It is known that leaves of the Zamites type were borne on stems (Bucklandia) agreeing with Cycadeoidea in certain features but ^ Capelhni and Solms-Laubach (92) PI. v. fig. 2. ^ ggg Chapter 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
