. Fossil plants : for students of botany and geology . Paleobotany. Fig. 728. Protopiceoxylcm arcticum. (Cambridge Botany School.). Fig. 729. ProtopiceoxyhnEd- wardsi. Longitudinal view of the thick-waUed, pitted, epithelial cells of the resin- canals. (After Stopes.) vertical walls (fig. 728); 4—5 small simple pits occur on a few of the cells and on the upper and lower edges of some of the rays are empty elements of unequal breadth which in all probability are ray-tracheids. The wood agrees in the presence of vertical canals only and in the structure of the medullary rays with Proto- piceoxyl
. Fossil plants : for students of botany and geology . Paleobotany. Fig. 728. Protopiceoxylcm arcticum. (Cambridge Botany School.). Fig. 729. ProtopiceoxyhnEd- wardsi. Longitudinal view of the thick-waUed, pitted, epithelial cells of the resin- canals. (After Stopes.) vertical walls (fig. 728); 4—5 small simple pits occur on a few of the cells and on the upper and lower edges of some of the rays are empty elements of unequal breadth which in all probability are ray-tracheids. The wood agrees in the presence of vertical canals only and in the structure of the medullary rays with Proto- piceoxylon exstinctum Goth. In Gothan's species there are 2—4 bordered pits in the field, but the absence of a border in the Franz Josef Land wood may be a consequence of imperfect 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
