The dark horizontal lines on silver birch bark are the lenticels.[1]
A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of gymnosperms and dicotyledonous flowering plants.[2] It functions as a pore, providing a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases. The name lenticel, pronounced with an [s], derives from its lenticular (lens-like) shape.[3] The shape of lenticels is one of the characteristics used for tree identification.[4]
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"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". Archived from the original on 2013-11-17. Retrieved 2012-08-19.
^Esau, K. (1953), Plant Anatomy, John Wiley & Sons Inc. New York, Chapman & Hall Ltd. London
^Michael G. Andreu; Erin M. Givens; Melissa H. Friedman what the. "How to Identify a Tree". University of Florida IFAS extension. Archived from the original on 2013-05-14. Retrieved 2013-03-07.
A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody...
brown with age. Young lenticels are first greenish, then reddish-brown and thin. The lenticels on the bare and shiny lenticels are small and visible to...
if they come up from soil. The surface of these roots is covered with lenticel (small pores) which take up air into spongy tissue, which in turn uses...
fire. It is perforated by a large number of fine breathing pores called lenticels, through which oxygen diffuses. Bark is continually replaced by a living...
cylindrical and often branched, and determinate, spherical with prominent lenticels. Indeterminate nodules are characteristic of legumes from temperate climates...
addition, the tubers have small holes that allow breathing, called lenticels. The lenticels are circular and their number varies depending of the size of the...
atmosphere through the bark. lenticellate Having lenticels lenticular 1. lens-shaped. 2. covered in lenticels. lepidote covered with small scales. leprose...
(26–39 ft). The smooth bark is chestnut-brown, with prominent horizontal lenticels. The leaves are arranged alternately, simple, ovate-lanceolate, 5–13 cm...
10–15 mm in diameter, greenish to russet or brown, patterned with small pale lenticel spots when mature in mid to late autumn. There are two varieties: Torminalis...
smooth and white to greenish or dark gray, and often has conspicuous lenticels; on old trees, it remains smooth in some species, but becomes rough and...
still possible after the leaves have been dropped. The bark also contains lenticels that serve as pores for gas exchange (similar to the stomata on leaves)...
yellow and slightly bitter; twigs become brown with light brown dots (lenticels – small, oval, rounded spots upon the stem or branch of a plant, from...
the water level with stilt or prop roots and then absorbs air through lenticels in its bark. The black mangrove (Avicennia germinans) lives on higher...
firm flesh, and an improved shelf life. The look of the apple's light lenticels against its wine-red skin reminded focus groups of a galaxy against a...
a slightly rough, but flat, bark which is covered in small, circular lenticels which give it a rough texture. Other species in the genus Lindera also...
bark of all birches is characteristically marked with long, horizontal lenticels, and often separates into thin, papery plates, especially upon the paper...
packed cells in the periderm that function in gas exchange are called lenticels. Secondary xylem is commercially important as wood. The seasonal variation...
production is heavy, fruit is medium or medium-large, with smooth skin; white lenticels, no russet, excellent taste characteristics. Ripens first week of October...
margin. The smooth bark is a brownish red, with prominent horizontal lenticels. The outer layer of the bark is remarkably tough, approaching the strength...
twigs are slender and zigzag, nearly black in color, spotted with lighter lenticels. The winter buds are tiny, rounded and dark red to chestnut in color....
greenish-grey and smooth on young trees with dark grey diamond-shaped lenticels, becoming dark grey and fissured on older trees.[citation needed] The...
bole diameter of up to 30 cm (12 in). Its smooth bark is brown, with lenticels. The leaves are obovate to oblanceolate and measure up to 22 cm (9 in)...
crown. The bark is reddish brown to gray brown, with short horizontal lenticels (warty corky ridges), becoming slightly scaly, The plant has an unpleasant...
various other plant structures. For example, they are present in the lenticels on the stems of many plants and the net structure in the rind of a netted...
characteristic of most birches, with smooth bark and distinct horizontal lenticels. It is sometimes mistakenly identified as a cherry tree. In older tree...
leaflets that are notched at the tip. The woody stems are greyish-brown with lenticels. The flowers are clustered in racemes and are chocolate-scented, with...
Young branches are covered with small brown hairs that turn into red lenticels as the branches mature. T. orientale flowers from May to June. The small...
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