. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. :rn CHAPTER VIII WOOD PARENCHYMA In our present studies we recognize as wood parenchyma all those elements which, in association with tracheids. hav. their major axes extended parallel with the principal axis of growth • and which, V accordance with accepted limitations, are charac- by thcr more or less cylindrical form, abrupt termina- tions and relatively thin walls. Such elements do not occur in wood of 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. :rn CHAPTER VIII WOOD PARENCHYMA In our present studies we recognize as wood parenchyma all those elements which, in association with tracheids. hav. their major axes extended parallel with the principal axis of growth • and which, V accordance with accepted limitations, are charac- by thcr more or less cylindrical form, abrupt termina- tions and relatively thin walls. Such elements do not occur in wood of the Cordaitales, and they are infrequent in the Ging- koales, but they are somewhat conspicuous features of the Coni- fcrales, where they acquire great prominence either because of thcr peculiar contents or their association with somewhat highly speca ized tissues. They differ in their structure as in their special unctions, though in the main they are connected with the production of resinous matter; and inasmuch as their mo^^t prominent feature is usually found in associated products of cel- lular activity, it will be most convenient to discuss them under specific names, which may serve to direct attention to their par- ticular purposes in the plant economy. They may therefore be classified as follows: j j ^ u^ Wood parenchjTtia: a. Crj-stallogenous i(''oblasts. b. Resin celLs. # CrVSTALLOGENOUS J .OBLASTS The investigations of Eichlcr (15, 35) show that in Gin^' -^ the wood IS characterized by the presence of wood-parenchyma col s, which take the form of short idioblasts of lenticular form m longitudinal section, and are distinguished by the storage of crystals of calcium oxalate. Such structures are peculiar to this 109. 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),
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