. Fossil plants : for students of botany and geology . Paleobotany. XXXIIl] DADOXYLON 259 Dadoxylon permiense (Renault). This Permian species from Autun^ differs from typical examples of the genus in the differentiation of the pith into a central thin- walled region contracted into transverse diaphragms surrounded by a cylinder of stouter tissue and in the greater breadth of the. Fig. 476. Dadoxylon Pedroi. of the secondary wood, wood. (After ZeiUer.) A, transverse section showing the pith and part B, longitudinal section of part of the secondary medullary rays. The tracheids have 3—4 rows of
. Fossil plants : for students of botany and geology . Paleobotany. XXXIIl] DADOXYLON 259 Dadoxylon permiense (Renault). This Permian species from Autun^ differs from typical examples of the genus in the differentiation of the pith into a central thin- walled region contracted into transverse diaphragms surrounded by a cylinder of stouter tissue and in the greater breadth of the. Fig. 476. Dadoxylon Pedroi. of the secondary wood, wood. (After ZeiUer.) A, transverse section showing the pith and part B, longitudinal section of part of the secondary medullary rays. The tracheids have 3—4 rows of pits of the usual type. Spirally disposed, decurrent, leaf-bases occur on the surface of the stem, and the cortex includes secretory canals and strands of hypodermal stereome. A small number of veins pass up the median part of the lamina which in this respect and in its ' Renault (96) A. p. 350; (93) A. PI. Lxxvn. 17—2. 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
