The dark horizontal lines on silver birch bark are the lenticels.
Lenticels on Prunus serrula
Lenticels on wild cherry or gean
Alder bark (Alnus glutinosa) with characteristic lenticels and abnormal lenticels on callused areas
Lenticels on potatoes of the Monalisa variety
Lenticels on Williams pear varieties

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 dicotyledonous flowering plants.

- Lenticel

210 related topics


Bark (botany)

Outermost layers of stems and roots of woody plants.

Bark of mature mango (Mangifera indica) showing lichen growth
Japanese Maple bark
The bark of Pinus thunbergii is made up of countless shiny layers.
Tree cross section diagram
Bark of a pine tree in Tecpán, Guatemala.
Damaged bark of a cherry tree
Living tree bark enveloping barbed wire
Bark chips
Backpack made of birch bark. Museum by Lake Baikal, Russia
Bark of pine was used as emergency food in Finland during famine, last time during and after civil war in 1918.
The patterns left in the bark of a Chinese Evergreen Elm after repeated visits by a Yellow-Bellied Sapsucker (woodpecker) in early 2012.
The self-repair of the Chinese Evergreen Elm showing new bark growth, lenticels, and other self-repair of the holes made by a Yellow-Bellied Sapsucker (woodpecker) about two years earlier.
Alder bark (Alnus glutinosa) with characteristic lenticels and abnormal lenticels on callused areas.
Sun scald damage on Sitka spruce
Eucalypt bark
Close-up of living bark on a tree in England
Acer capillipes (Red Snakebark Maple)
Monterey Pine bark
A rare Black Poplar tree, showing the bark and burls.
The typical appearance of Sycamore bark from an old tree.
Quercus robur bark with a large burl and lichen.
Kauri bark
Beech bark with callus growth following fire (heat) damage
Damaged bark
Common oak bark
"Rainbow" Eucalyptus bark on the Hawaiian island of Maui
The old bark has a metallic luster. In 2016, the height of the tree was 15 meters and the bust circumference was 5.7 meters. Samanea saman

Within the periderm are lenticels, which form during the production of the first periderm layer.


Shrub or tree that grows in coastal saline or brackish water.

Mangroves are hardy shrubs and trees that thrive in salt water and have specialised adaptations so they can survive the volatile energies of intertidal zones along marine coasts
Red mangrove
Salt crystals formed on an Avicennia marina leaf
A germinating Avicennia seed
Not shown are introduced ranges: Rhizophora stylosa in French Polynesia, Bruguiera sexangula, Conocarpus erectus, and Rhizophora mangle in Hawaii, Sonneratia apelata in China, and Nypa fruticans in Cameroon and Nigeria.
Bacterial taxonomic community composition in the rhizosphere soil and fungal taxonomic community composition in all four rhizosphere soil and plant compartments. Information on the fungal ecological functional groups is also provided. Proportions of fungal OTUs (approximate species) that can colonise at least two of the compartments are shown in the left panel.
Reference sequences are coloured black, and virome contigs are indicated with varied colours. The scale bar represents half amino acid substitution per site.
Mangrove roots at low tide in the Philippines
Mangroves are adapted to saline conditions
Pneumatophorous aerial roots of the grey mangrove (Avicennia marina)
Vivipary in Rhizophora mangle seeds

The red mangrove (Rhizophora mangle) survives in the most inundated areas, props itself above the water level with stilt or prop roots and then absorbs air through lenticels in its bark.

Aerial root

Aerial roots are roots above the ground.

The Grey Mangrove (Avicennia marina)'s pneumatophorous aerial roots
A Schefflera arboricola indoor bonsai soon after branch pruning to show extensive aerial roots.
Banyan tree of undetermined species in Fort Myers, Florida
European Beech with aerial roots in a wet Scottish Glen.
Hybrid elm cultivar with aerial roots, Edinburgh
Indian banyan Tree in Kodungallur Temple, Kerala, India
Pneumatophores of mangrove plant

The surface of these roots are covered with lenticel (small pores) which take up air into spongy tissue which in turn uses osmotic pathways to spread oxygen throughout the plant as needed.


Suberin, cutin and lignins are complex, higher plant epidermis and periderm cell-wall macromolecules, forming a protective barrier.

For example, they are present in the lenticels on the stems of many plants and the net structure in the rind of a netted melon is composed of suberised cells.


Thin-leaved deciduous hardwood tree of the genus Betula, in the family Betulaceae, which also includes alders, hazels, and hornbeams.

The front and rear view of a piece of birch bark
Birch leaves
Fossil leaf of Betula leopoldae
Frosty birches in Kangasala, Finland in February 2013
Birch trees by a river in Hankasalmi, Finland
A stand of birch trees
A birch tree in autumn
Birch plywood
Finnish bath broom called vihta, braided from birch twigs
A birch bark inscription excavated from Novgorod, circa 1240–1260
Birch tree forest at Ishkoman, Gilgit-Baltistan, Pakistan
Birch leaves in the coat of arms of Karjalohja

The bark of all birches is characteristically marked with long, horizontal lenticels, and often separates into thin, papery plates, especially upon the paper birch.

Betula pubescens

Betula pubescens (syn.

The branches are upward or horizontally spread, but never pendulous (as with silver birch)
Betula pubescens near a path encircling a lake inside the Arctic Circle in Tromsø
Arctic downy birch forms the tree line in most of Fennoscandia
Scarce dagger larva feeding on the moor birch
Betula pubescens is a pioneering species, seen expanding its altitudinal range here in Norway

It is a deciduous tree growing to 10 to 20 m tall (rarely to 27 m), with a slender crown and a trunk up to 70 cm (exceptionally 1 m) in diameter, with smooth but dull grey-white bark finely marked with dark horizontal lenticels.


Genus of 25–30 species of deciduous flowering plants in the family Salicaceae, native to most of the Northern Hemisphere.

Mature trembling aspen trees (Populus tremuloides) with young regeneration in foreground, in Fairbanks, Alaska
Male catkins of Populus × canadensis
The seeds of the poplar tree are easily dispersed by the wind, thanks to the fine hairs surrounding them.
A Populus on a hill through April, September, October, February (Germany)
Populus nigra in autumn
Populus × petrowskiana ("Czar's Poplar") in Heinola, Finland
Leaves of Populus lasiocarpa
Fastigiate black poplar cultivar of the Plantierensis group, in Hungary
Poplars dominate the flora of Khorog City Park, Gorno-Badakhshan, Tajikistan
Popular Populus variety G48 in Punjab, India; Jhalli Farms Village Niara/Hoshiarpur
Traditional Pamiris house
Rotor poplar and willow cuttings planter, planting a new nursery of poplar for biomass with short rotation

The bark on young trees is smooth, white to greenish or dark gray, and often has conspicuous lenticels; on old trees, it remains smooth in some species, but becomes rough and deeply fissured in others.

Prunus serrulata

Species of cherry tree that grows naturally in Japan, China, and Korea, and it also refers to a cultivar produced from Prunus speciosa , a cherry tree endemic in Japan.

P. serrulata flowers
Bark showing lenticels
Leaf close up
Kurozome, the tree spirit of the Japanese Cherry Tree
Cultivar flower close up
Prunus serrulata – Cherry blossoms
Typical autumn foliage
'Ukon' (Prunus lannesiana Wilson cv. 'Grandiflora')

Prunus serrulata is a small deciduous tree with a short single trunk, with a dense crown reaching a height of 26 - 39 ft. The smooth bark is chestnut-brown, with prominent horizontal lenticels.

Hibiscus syriacus

Species of flowering plant in the mallow family, Malvaceae.

Hibiscus syriacus flower with Migrant hawker (Aeshna mixta)
Hibiscus syriacus 'Oiseau Bleu'
Hibiscus syriacus 'Ardens' – double-flowered
The Presidential Standard of South Korea, with a pair of phoenixes flanking the Korean rose.
From the 8th century to today, This tree is popular as a garden tree for ordinary Japanese households.

The branches are thin and gray, white-lenticeled, with raised leaf scars and small buds.

Ailanthus altissima

Deciduous tree in the family Simaroubaceae.

Botanical drawing of the leaves, flowers, and samaras from Britton and Brown's 1913 Illustrated flora of the northern states and Canada
Immature seeds on a female tree.
Tree of Heaven resprouting even after herbicide use to restore Red Butte Creek in Salt Lake City
Ailanthus altissima growing in Australia.
A female bearing a heavy load of seeds in Valladolid, Spain
Female tree growing in Chicago, Illinois
Leaves in autumn
A male ailanthus silkmoth from the Texas A&M University insect collection

They have lenticels and heart-shaped leaf scars (i.e., a scar left on the twig after a leaf falls) with many bundle scars (i.e., small marks where the veins of the leaf once connected to the tree) around the edges.