Secondary Growth

secondary xylem (tracheids, vessel elements), vascular cambium, secondary phleum	secondary xylem, vascular cambium, secondary phloem, phloeum fibers	phellum, cork cells, pheloogen, meristematic cells, phelloderm, parenchyma cells	cortex, phelloderm, phellogen, phellum
cross section of secondary xylem, xylem rays, vessel elements, springwood, summerwood, annual ring	radial section of wood	lenticle formation showing outer cortex and very edge of primary phloem	lenticle, cortex, secondary phloem, cambium, secondary xylem, primary xylem, pith

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