The slides on the far right of this group show: periderm (phellum, phellogen, phelloderm), cortex, primary phloem, primary phloem fibers, secondary phloeum, vascular cambium, secondary xylem, vessel elements, primary xylem, pith, parenchyma cells in the pith, bark, wood.-some are barely visible.
Not all of the these tissues are found in the remaining 3 slides. In addition, some of these 3 slides show xylem rays, phloem rays, vascular rays, summerwood, springwood, and annual ring.

Almost all of the terms in the above group of pictures can be shown in the pictures below.
cross section of 1-year old stem	2-year old stem	3-year old stem	4-year old stem
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

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