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cello alines |
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Answer» Resin ducts are common in the Pinaceae. The comparative anatomy of stems and leaves of 50 species and two varieties from ten genera has been investigated. The structure and distribution of resin ducts differ among genera. Resin ducts occur in foliage leaves of ten genera of Pinaceae. Cortical resin ducts are absent in the stems ofPseudolarixandLarix. Resin ducts only occur in the secondary xylem of stems ofPinus, Picea, Cathaya, Larix, Pseudotsugaand someKeteleeriaspecies. All of the epithelial and sheath cells are alive and thin-walled in the resin ducts of stem cortex and mesophyll. |
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