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Initiation of lenticel in the bark of a one year-old elderberry (presenceof collenchyma)

Legend:

1  cork
3  lenticel
4  collenchyma
5  parenchyma
7  secondary phloem
8  cambium
9 secondary xylem
2  cork cambium
6  sclerenchyma

English name: Elderberry
Scientific name: Sambucus sp.
Familia: Caprifoliaceae
Classis: Dicotyledonas
Phylum: Angiospermae
Regnum: Plantae

Cross-section through a 1 year-old stem of elderberry. Gas exchange between the inner tissue and the surrounding is only possible at the lenticel, but not in other regions covered by cork.