. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. 232 ANATOMY OF THE GYMNOSPERMS Radial. Ray tracheids chiefly narrow, very unequal, often high, sometimes present, then rather abundant and composing the enti ray when of 1 or 2 cells only, usually absent from the higher rays. Medullary rays contracted at the ends; the upper and lower walls medium to thick, unequal, frequently pitted or again entire or distantly pitted; the terminal walls thin, often curved and loca
. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. 232 ANATOMY OF THE GYMNOSPERMS Radial. Ray tracheids chiefly narrow, very unequal, often high, sometimes present, then rather abundant and composing the enti ray when of 1 or 2 cells only, usually absent from the higher rays. Medullary rays contracted at the ends; the upper and lower walls medium to thick, unequal, frequently pitted or again entire or distantly pitted; the terminal walls thin, often curved and locally thickened; the lateral walls with round or oval pits, the orifice lenticular, 1-2, or in the marginal cells and low rays, 6, per tracheid. Pits on the tangential walls of the summer tracheids very small and often obscure. Bor- dered pits round or elliptical in 1 row, or in radially broad tracheids in 2 rows. Kesin cells not numerous, 20-25 y, wide, 150-175 u long. Tangential. Rays medium, wholly i-seriate ; the cells narrow, oblong. Wood very light and soft, but very durable in the soil. Relative specific gravity Approximate relative fuel value ' Coefficient of elasticity in kilograms on millimeters . 404. Ultimate transverse strength in kilograms 194. Ultimate resistance to longitudinal crushing in kilograms 4149. Resistance to indentation to mm. in kilograms . 1074. (Sargent) Cape Breton Island and near Halifax (Macoun); southern Maine, south- ward along the coast to Florida, thence westward along the Gulf coast to Pearl River, Mississippi (Sargent). The Pleistocene deposits of the Don Valley, Toronto. Material not pet- rified, but often showing the effects of advanced decay. 2. C. Lawsonijuu, A. Murr. Port Orford Cedar. Oregon Cedar. White Cedar. Lawson's Cypress. Ginger Pine Transverse. Growth rings very narrow, variable, the structure very open throughout. Summer wood very thin, of 1-5 tracheids, sometimes double and then upwards of 14 tracheids, the t
Size: 947px × 2638px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherbostonginnco, books
