. Studies in fossil botany . Paleobotany. 412 STUDIES IN FOSSIL BOTANY secondary wood attained a considerable thickness, and is divided up into distinct groups, corresponding to the peripheral primary strands, and separated from one another by the principal medullary rays, while numerous secondary rays are also present. The bordered pits S| Fig. 158. — Hctcra>igium tiliacoidcs. Radial section through part of secondary wood and phloem. -V-, secondary wood ; //•', fully developed pitted tracheides ; tr, tracheides with pits beginning to form ; cb, cambium ; />/fi, secondary phloem
. Studies in fossil botany . Paleobotany. 412 STUDIES IN FOSSIL BOTANY secondary wood attained a considerable thickness, and is divided up into distinct groups, corresponding to the peripheral primary strands, and separated from one another by the principal medullary rays, while numerous secondary rays are also present. The bordered pits S| Fig. 158. — Hctcra>igium tiliacoidcs. Radial section through part of secondary wood and phloem. -V-, secondary wood ; //•', fully developed pitted tracheides ; tr, tracheides with pits beginning to form ; cb, cambium ; />/fi, secondary phloem; sv, sieve-tubes ; ;, sieve-plate ; r, phloem-ray. X 112. Phil. Trans., W. and S. Will. Coll. 162S. on the tracheal walls are exquisitely preserved, and in favourable cases their development can even be traced, in the elements bordering on the cambium (Fig. 158, tr). The cambium itself is also perfectly preserved, but the special interest of the specimen centres in the phloem, which is perhaps better shown. 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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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondonaandcblack
