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Fig. 6. Light micrographs of longitudinal section through cambial zone and bark of healthy one-year-old hybrid poplar cutting showing cambial zone (CZ), secondary phloem (SP), secondary phloem fibers (SPF), primary phloem (PP), primary phloem fibers (PPF), sclerids (S), ray cells (R), dilated ray (DR), crystal-containing cells (CC), cortex (CTX), and periderm (PER). Bar = 40 microns. |
