. The anatomy of woody plants. Botany -- Anatomy. 344 THE ANATOMY OF WOODY PLANTS scale the conditions found in the double scales of the ovuliferous strobilus of the Abietineae. The reproductive features conse- quently supply some evidence for the association of the podocarps with the abietineous conifers. The organization of the wood in the group under consideration is very similar to that found in the Cupressineae and Taxodineae. The tracheids possess opposite pitting and bars of Sanio. The parenchyma is abundant and scattered throughout the annual ring. A clear difference from the Cupressin
. The anatomy of woody plants. Botany -- Anatomy. 344 THE ANATOMY OF WOODY PLANTS scale the conditions found in the double scales of the ovuliferous strobilus of the Abietineae. The reproductive features conse- quently supply some evidence for the association of the podocarps with the abietineous conifers. The organization of the wood in the group under consideration is very similar to that found in the Cupressineae and Taxodineae. The tracheids possess opposite pitting and bars of Sanio. The parenchyma is abundant and scattered throughout the annual ring. A clear difference from the Cupressineae and Taxodineae is supplied, however, by experi- mental evidence, since neither traumatic resin canals nor margi- nal ray-tracheids have been found as yet in any of the genera of the Podocarpineae. We shall prob- ably not make further advance in the final determination of the phylogenetic or evolutionary position of this subtribe of the Coniferales until our present ex- tremely meager knowledge of the fossil conifers of the Southern Hemisphere has been notably in- creased. It seems highly prob- able, on the basis of the organiza- tion of the scales of the female cone and of the sporophylls and spores of the male cone, that the Podocarpineae have abietineous affinities. Their final position will ultimately be determined by a better knowledge of the anatomy of extinct forms. Of the coniferous subtribes enumerated in the preceding pages the Taxineae have not as yet been considered FIG. 250.—Longitudinal section of a traumatic resin canal in the same 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 Jeffrey, Edward C. (Edward Charles), b. 1866. Chicago, Ill. , The University of Chicago Press
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