Lenticel

The dark horizontal lines on Silver birch bark are the lenticels.^[1]

Bark of a pine tree in Tecpán, Guatemala. Here, the lenticels are in the cracks of the bark.

A lenticel is porous tissue in the bark of trees. Its cells make large intercellular spaces in the periderm of the bark. They are found in the woody stems and roots of dicotyledonous flowering plants.^[2]

Lenticels are also found in other woody plants, starting in the Carboniferous period. The development and increase in these primitive lenticels gave a system for aeration and gas exchange in these plants.^[3]

Lenticels work as pores for the direct exchange of gases. Otherwise the bark is impermeable to gases. The name 'lenticel' comes from its lenticular (lens-like) shape.^[4] The shape of lenticels is one of the characteristics used for tree identification.^[5]

Lenticel Media

zelfgemaakte foto van de Sterappel; begin december

References

↑ "Lenticel". The American Heritage Science Dictionary, Houghton Mifflin Company, via dictionary.com. Retrieved on 2007-10-11
↑ Gibson, Arthur C.. 'Bark Features in General Botany. Retrieved 2012-08-19.
↑ Hook, Donald D.. Aeration in Trees. Botanical Gazette 133 (4) (December 1972). p. 443–454. doi:10.1086/336669.
↑ Esau, K.. Plant Anatomy (1953)John Wiley & Sons Inc. New York, Chapman & Hall Ltd. London.
↑ Michael G. Andreu. How to Identify a TreeUniversity of Florida IFAS extension. Retrieved 2013-03-07.

[1] "Lenticel". The American Heritage Science Dictionary, Houghton Mifflin Company, via dictionary.com. Retrieved on 2007-10-11

[2] Gibson, Arthur C.. 'Bark Features in General Botany. Retrieved 2012-08-19.

[3] Hook, Donald D.. Aeration in Trees. Botanical Gazette 133 (4) (December 1972). p. 443–454. doi:10.1086/336669.

[4] Esau, K.. Plant Anatomy (1953)John Wiley & Sons Inc. New York, Chapman & Hall Ltd. London.

[5] Michael G. Andreu. How to Identify a TreeUniversity of Florida IFAS extension. Retrieved 2013-03-07.

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