. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. Fig 22^ CUPRESSUS Macnabiana. Medullary ray showing the form and position of the pits; the thin, curved, and locally thickened terminal walls, x 280 wood may be only locally thickened, but in such cases the typ- ical feature always appears in the summer wood, where such secondary alterations are most strongly emphasized. For taxonomic purposes such features possess a definite value. The thick-walled cells of Tsuga.
. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. Fig 22^ CUPRESSUS Macnabiana. Medullary ray showing the form and position of the pits; the thin, curved, and locally thickened terminal walls, x 280 wood may be only locally thickened, but in such cases the typ- ical feature always appears in the summer wood, where such secondary alterations are most strongly emphasized. For taxonomic purposes such features possess a definite value. The thick-walled cells of Tsuga. Larix, and Picea p rmit of an. Fig. 23. Juniperus occidentaliS. Medullary ray showing the form and dispo sition of the pits on the lateral walls; the thick and coarsely pitted termin .1 walls. X 280 easy and definite segregation of these three genera in those cases which otherwise might involve a strong element of doubt, and the same rule holds true, though to a less extent, with respect to the locally thickened walls in Cupressus and related genera. Pits on the lateral walls of the ray cells are an invariable feature of all investigated species of Gingkoales and Coniferales,. 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 Penhallow, D. P. (David Pearce), 1854-1910. Boston : Ginn & Co.
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