![](http://www.alamy.com/thumbs/6/29D75045-CE08-456D-84B5-ED5CEB778A27/B2RK2E.jpg)
Lenticels on trunk of "paper birch", Betula papyrifera
Size: 4425px × 6796px
Photo credit: © Martin Shields / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: bark, betula, birch, botany, exchange, gas, lenticel, lenticels, paper, papyrifera, physiology, plant, stem, structure, tree, trunk