. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. if a^ ANATOMY OF THE (lYMNOSPERMS 7. C. arlMnk*, Cireene I'yfrtss Transvtrst. Growth rings medium, rather uniform. Summer wood very thin, upwards of 6 tracheir* and passing very gradually into the spring wood. The very broad spring wood somewliat open, the very variable tracheids chiefly squarish-hexagonal, the walls not thin. Kesin cells numerous and prominent, narrowly zonate in both the spring and summer woods,
. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. if a^ ANATOMY OF THE (lYMNOSPERMS 7. C. arlMnk*, Cireene I'yfrtss Transvtrst. Growth rings medium, rather uniform. Summer wood very thin, upwards of 6 tracheir* and passing very gradually into the spring wood. The very broad spring wood somewliat open, the very variable tracheids chiefly squarish-hexagonal, the walls not thin. Kesin cells numerous and prominent, narrowly zonate in both the spring and summer woods, sometimes in groups of larger and thicker- walled cells, showing a tendency to the formation of resin Medullary rather prominent, somewhat resinous, rather numerouii and broad, i cell wide, distant 2-10 tracheids. Radial. Rays devoid of tracheids and sparingly resinous, the cells con- spicuously contracted at the ends, equal to about 6-9 spring ; the terminal walls chiefly straight, sparingly and locally thickened ; the upper and lower walls medium to thick, not obviously pitted ; the lat- eral walls with round or oval pits 1-2, or in the marginal cells 4, per tracheid. Bordered pits round or elliptical, rather numerous, in 1 row. Pits on the tangential walls of the summer tracheids rather numer- ous and large, open. Kesin cells not numerous, 15-20 ^ wide, 120- 250 ^lon§, chiefly about 200/1; sometimes in multiple .sei'es of much broader, very variable, often isodiametric and thick-walled cells, show- ing a strong tendency to the formation of resin canals. Tangential. Kays medium, the cells broad, more or less resinous, trans- versely oval, or in the low rays vertically oval. Wood soft, light, and coarse grained. Kelative specific gravity (Sargent) San Francisco Mountains of New Mexico and Arizona, where the tree forms extensive forests on the northern slopes of the mountains at eleva- tions of 5000-8000 feet; Santa Catalina and Santa Kita mount
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