. 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. 24. PiNUS Medullary ray showing („) the form and disposition of the pits on the lateral walls; {/>) the ray tracheids. x 280 or p. reflexa (fig. 24), they attain to maximum 3ize and occupy nearly the entire surface of the wall within the limits of a wood tracheid, thereby becoming few in number. In Sequoia (fig. 25) or Taxodium (fig. 20) they are typically oval, in Pinus cubensis. Fig. 25. Sequoia
. 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. 24. PiNUS Medullary ray showing („) the form and disposition of the pits on the lateral walls; {/>) the ray tracheids. x 280 or p. reflexa (fig. 24), they attain to maximum 3ize and occupy nearly the entire surface of the wall within the limits of a wood tracheid, thereby becoming few in number. In Sequoia (fig. 25) or Taxodium (fig. 20) they are typically oval, in Pinus cubensis. Fig. 25. Sequoia gigantea. Medullary ray showing the form and disposition of the pits or. the lateral walls, x 280 or P. taeda (fig. 26) they are variously lenticular, while in P. resi- nosa or P. koraiensis they are oval or oblong, or even quad- rangular. Such variations as a whole are far more numerous and sharply defined in Pinus than in any other genus known. In all the investigated genera the pit is bordered. This finds. 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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