. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. .5| Ms M 326 ANATOMY OF THE GYMNOSFICRMS The following determinations are after Bovey ; Coefficien il strength in pounds for: Bending SA^o Elasticity 1,430,000 Torsion 11,500 Compression 3<9°° Shear 380 Weight per cubic foot 33 Rather a widely distributed but somewhat localized tree flourishing partic- ularly in the poorest soils: Nova Scotia, New Brunswick, Quebec, and w;;stward to Lake of the Woods (Macoun); t
. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. .5| Ms M 326 ANATOMY OF THE GYMNOSFICRMS The following determinations are after Bovey ; Coefficien il strength in pounds for: Bending SA^o Elasticity 1,430,000 Torsion 11,500 Compression 3<9°° Shear 380 Weight per cubic foot 33 Rather a widely distributed but somewhat localized tree flourishing partic- ularly in the poorest soils: Nova Scotia, New Brunswick, Quebec, and w;;stward to Lake of the Woods (Macoun); through the New England States to northern Pennsylvania and westward to Michigan and central Minnesota (Sargent). 22. P. tropicalis, Morelet Trami'trse. Growth rings narrow, unequal. Summer wood chiefly rather dense but somewhat variable, usually exceeding the spring; the tra- cheids hexagonal-oblong, uniform, and in regular rows ; transition from the spring wood abrupt or more rarely gradual. Spring tracheids large, conspicuously squarish or hexagonal, the walls rather thin. Medullary rays prominent, resinous, 1 cell wide, broad, distant 2-8, or more rarely 12, rows of tracheids. Resin passages num»»-ous, large, resinous, and chiefly confined to the summer wood; the epithelium of 1-2 rows of thin-walled cells which often form tangentially extended tracts. Radial. Ray tracheids rather low and rather sparingly dentate, never reticu- late ; numerous and interspersed, often predominant. Medul'.i y , the cells all of one kind; the upper, lower, and term. x\ walls thin and commonly much broken down; the side walls with larxe, oval, oblong, or lenticular pits, 1-2, chiefly 1, per tracheid, in tht- summer wood often reduced and vertically lenticular. Tits on the tangential walls of the summer tracheids wholly wanting, but often appearing on the tangential walls of the first spring tracheid. Bor- dered pits large, in I row or in pairs, the latter often approximating
Size: 1602px × 1559px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherbostonginnco, books
