. Fossil plants : for students of botany and geology . Paleobotany. XLIV] PROTOPICEOXYLON 233 and narrow; several oval or circular spaces are conspicuous in transverse section, some being true canals and others the result of decay. There are 2—3 opposite rows of bordered pits on the radial walls of the tracheids. Partially destroyed rows of resin- parenchyma occur which probably belong to secretory canals. The uniseriate and comparatively deep medullary rays, 20—30 cells, are characterised by rather thick and pitted horizontal and. Fig. 728. Protopiceoxylcm arcticum. (Cambridge Botany School.)
. Fossil plants : for students of botany and geology . Paleobotany. XLIV] PROTOPICEOXYLON 233 and narrow; several oval or circular spaces are conspicuous in transverse section, some being true canals and others the result of decay. There are 2—3 opposite rows of bordered pits on the radial walls of the tracheids. Partially destroyed rows of resin- parenchyma occur which probably belong to secretory canals. The uniseriate and comparatively deep medullary rays, 20—30 cells, are characterised by rather thick and pitted horizontal and. Fig. 728. Protopiceoxylcm arcticum. (Cambridge Botany School.). 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
