. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. MKI)L'J,\kV RAYS 83 (fig. 23). It occurs exceptionally in Juniperus and Pinus. but it IS typical m Abies ( per cent). Tsuga (100 per cent), Larix (100 per cent), and Kcea (90 per cent). In Abies and Juniperus. where transitional forms sometimes occur, the walls in the spring. Fig 22^ CUPRESSUS Macnabiana. Medullary ray showing the form and position of the pits; the thin, curved, and locally thickened termina
. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. MKI)L'J,\kV RAYS 83 (fig. 23). It occurs exceptionally in Juniperus and Pinus. but it IS typical m Abies ( per cent). Tsuga (100 per cent), Larix (100 per cent), and Kcea (90 per cent). In Abies and Juniperus. where transitional forms sometimes occur, the walls in the spring. 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. 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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