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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]
As the stem grows, the cork cambium produces new layers of cork which are impermeable to gases and water and the cells outside the periderm, namely the epidermis, cortex and older secondary phloem die. [32] Within the periderm are lenticels, which form during the production of the first periderm layer. Since there are living cells within the ...
The stem of a plant, especially a woody one; also used to mean a rootstock, or particularly a basal stem structure or storage organ from which new growth arises. Compare lignotuber. caudiciform Stem-like or caudex-like; sometimes used to mean "pachycaul", meaning "thick-stemmed". caudicle diminutive of caudex.
A shrub or small tree reaching a height of 8 metres and a stem diameter of 15 cm. The bark is smooth and grey, dotted with small lenticels, arranged in vertical and horizontal patterns. The grey or fawn coloured branchlets also feature lenticels. Leaves alternate with a finely toothed edge. 4 to 9 cm long, ovate shaped with a long pointed tip.
Leaf stem 2 to 5 mm long. The stem is hairless and is marked with lenticels (or raised resinous dots). [3] Four petalled, greenish-yellow flowers, which appear in spring and summer, form on cymes, petals 1 to 3 mm long. The petals are actually the sepals which grow to enwrap the fruit as it develops.
A stem is one of two main structural axes of a vascular plant, the other being the root. It supports leaves , flowers and fruits , transports water and dissolved substances between the roots and the shoots in the xylem and phloem , engages in photosynthesis, stores nutrients, and produces new living tissue. [ 1 ]
The bark is grey and covered with lenticels, becoming thick and deeply fissured on old trees. The bark can become hard enough to cause sparks when cut with a chainsaw. [9] The stem is grey in the older parts and light brown in younger parts. The crown is usually roughly conical and quite dense. In large trees, the lower branches droop downwards.
The d'Anjou is considered a medium to large pear, typically around 270–285 grams, 85 mm in height, and 80 mm in diameter. It has a wide, globular base, short stem, and thin skin with many notable lenticels.