Cross Section Collection (#81)

Begonia stem, light mictograph
Begoinia stem. Light micrograph of a transverse section through the stem of a begonia (Begonia sp.) plant. At centre is a large area of pith, which contains starch grains (orange) a store of energy

Marsh marigold flower bud. Light micrograph of a cross-section through the anther of an immature marsh marigold (Caltha palustris) flower bud

Dicotyledon leaf, light micrograph
Dicotyledon leaf. Light micrograph of a transverse section through a typical dicotyledon leaf. The section passes through the midrib

Blackcurrant plant stem, light micrograph
Blackcurrant plant stem. Light micrograph of a cross-section through the stem of a blackcurrant (Ribes nigrum) plant. The outer cortex (blue and pale brown) is made of cork cambium tissue

Sunflower root, light micrograph
Sunflower root. Polarised light micrograph of a transverse section through the root of a sunflower (Helianthus annuus) plant

Spikenard stem, light micrograph
Spikenard stem. Light micrograph of a cross-section through the stem of a Spikenard (Aralia sp.) tree. The dark red cells just beneath the surface bark are collenchyma cells

Buttercup root, light micrograph
Buttercup root. Light micrograph of a transverse section through the root of a buttercup (Ranunculus sp.) plant. At centre is the vascular bundle, comprising xylem (red) and phloem (blue) tissues

Potato starch grains, light micrograph
Potato starch grains. Polarised light micrograph of a transverse section through a potato tuber (Solanum tuberosum), showing the starch grains

Orchid starch grains, light micrograph
Orchid starch grains. Polarised light micrograph of a transverse section through an orchid tuber (Phaius grandifolius), showing the starch grains

Rose stem, light micrograph
Rose stem. Light micrograph of a cross-section through the stem of a rose (Rosa sp.). The three triangular protrusions are thorns, which protect the plant from being eaten by animals

Tomato root, light micrograph
Tomato root. Light micrograph of a transverse section through the centre root of a tomato (Lycopersicum esculentum) plant. Xylem cells, which transport water around the plant, are red

Buttercup flower bud, light micrograph
Buttercup flower bud. Light micrograph of a cross-section through an immature wallflower bud (Ranunculus sp.), showing the male and female reproductive organs of the flower

Squash root, light micrograph
Squash root. Light micrograph of a transverse section through a squash (Cucubita sp.) root. The large vessels (red) are xylem cells, which transport water. Parenchyma tissue is blue

Xylem and phloem plant tissue, SEM
Xylem and phloem plant tissue. Coloured scanning electron micrograph (SEM) of a transverse section through the stem of a woody plant

Sunflower stem, light micrograph
Sunflower stem. Light micrograph of a transverse section through the stem of a sunflower (Helianthus annuus) plant, showing a vascular bundle

Radish root, light micrograph
Radish root. Light micrograph of a transverse section through the root of a radish (Raphanus sativa) plant. The outer layer is cork cambium (red)

Root fungus, light micrograph
Root fungus. Light micrograph of a cross-section through a root containing fungal hyphae called endotrophic mycorrhiza. The hyphae (green and blue)

Human ear anatomy, artwork
Human ear anatomy. Computer artwork of the structure of the human ear, showing the outer ear, middle ear and inner ear. The inner ear contains the cochlea (coiled, upper centre)

Dog rose stem, light micrograph
Dog rose stem. Polarised light micrograph of a cross-section through the stem of a dog rose (Rosa canina) plant. The outer cortex (black and red) is made of cork cambium tissue

Fools parsley fruit, light micrograph
Fools parsley fruit. Light micrograph of a transverse section through the fruit (cremocarp) of a fools parsley (Aethusa cynapium)

Alexander flowers, light micrograph
Alexander flowers. Light micrograph of a section through a cluster of alexander flowers (Smyrnium olusatrum). Seen here are cross-sections of the central umbels

Sunflower leaf, light micrograph
Sunflower leaf. Light micrograph of a transverse section through the midrib of a sunflower (Helianthus annuus) leaf. The upper and lower epidermis on the surfaces of the leaf are blue

Elm stem, light micrograph
Elm stem (Ulmus procera) section, polarised light micrograph. The black horizontal lines are multiseriate rays, which are composed of several rows of cells

Beech leaves, light micrograph
Beech leaves. Light micrograph of a transverse section through two beech leaves (Fagus sylvatica). The shapes of the two leaves are different because the bottom leaf is constantly exposed to bright

Black pepper stem, light micrograph
Black pepper stem. Polarised light micrograph of a transverse section through the stem of a black pepper (Pipa nigrum) plant

Ginger leaf, light micrograph
Ginger leaf. Light micrograph of a transverse section through the midrib of a ginger (Zingiber officinale) leaf. The lower and upper epidermis (blue)

Dandelion root, light micrograph
Dandelion root. Light micrograph of a transverse section through a root of a dandelion (Taraxacum officinale). The root has undergone secondary thickening

Willow stem, light micrograph
Willow stem. Light micrograph of a cross-section through the stem of a willow (Salix sp.) tree. At centre is the pith (white), surrounded by woody xylem tissue (pink)

Bone marrow, SEM
Bone marrow, coloured scanning electron micrograph (SEM). This freeze-fracture has revealed the cavity (lumen) of a large venous sinus (pink), which contains mature blood cells (red)

Wood-boring insect larva tunneling through a piece of wood. A generic term for this sort of insect is woodworm. The larvae feed for several years on the interior of wooden objects

Lung bronchus cross-section, SEM
Lung bronchus cross-section, coloured scanning electron micrograph (SEM). This longitudinal freeze-fracture has exposed the inner epithelial surface of a bronchus (brown)

Nettle leaf gall midge larva, artwork. Cross- section through a stinging nettle leaf (Urtica dioica) and leaf gall. The gall is inhabited by the parasitic larva of the nettle gall midge

Liverwort spore cases, light micrograph
Liverwort spore cases. Light micrograph of a cross-section through five spore cases (sporophytes) from the liverwort Conocephalum conicum (Marchantiales)

Nettle leaf galls, artwork. Four views of galls at the base of a stinging nettle leaf (Urtica dioica). These abnormal outgrowths are caused by the parasitic larvae of the nettle gall midge

Damaged stinging nettle, artwork. Various views of a stinging nettle damaged by the weevil (Ceuthorhynchus pollinaris). At left are several enlarged views of sections of damaged stems and petioles

Maple stem, light micrograph
Maple stem. Polarised light micrograph of a cross-section through the stem of a field maple (Acer campestre). This shows the thick layer of cork (phellem)

Growth rings of a tree. Cross-section through a tree trunk showing annual growth rings. Growth rings are visible in a cross-section of a tree trunk after the tree has been felled

Abnormal thistle stem, light micrograph
Abnormal thistle stem. Light micrograph of a normal (top) and abnormal (bottom) stem of the perennial sow thistle (Sonchus arvensis). The abnormal stem has grown in a flattened, or fasciated, manner

Water-lily leaf stem, light micrograph
Water-lily leaf stem. Light micrograph of a cross- section through the leaf stem (petiole) of a white water-lily (Nymphaea alba)

Dutchmans pipe plant stem. Light micrograph of a section through the stem of a dutchmans pipe plant (Aristolochia sipho). The inner blue circle is a layer of sclerenchyma fibres

Stem section, SEM
Stem section. Coloured scanning electron micrograph (SEM) of a section through a stem of a woody dicotyledon plant. This stem consists mainly of secondary xylem tissue (orange, centre)

Walnut bark. Cross section through the trunk of a walnut tree (Juglans regia) revealing the pattern in its bark. This pattern is known as a rhytidome

Grass stem, SEM
Grass stem. Coloured scanning electron micrograph (SEM) of a section through a grass stem (family Graminaceae). At upper centre is the vascular bundle

Common horsetail stem, light micrograph
Common horsetail stem. Light micrograph of a cross-section through the tip of the condensed stem of the common horsetail (Equisetum arvense), showing the central stem sourrounded by stem leaves

Bamboo stem, SEM
Bamboo stem. Coloured scanning electron micrograph (SEM) of a section through a bamboo stem (Phyllostachys sp.). Vascular bundles can be seen (bright yellow) containing xylem (larger openings)

Woody stem section, SEM
Woody stem section. Coloured scanning electron micrograph (SEM) of a section through a stem of a woody plant. At upper centre is the pith (orange), which consists of soft, spongy parenchyma cells

Bracken rhizome, light micrograph
Bracken rhizome. Light micrograph of part of a cross-section through a rhizome from the bracken Pteridium aquilinum. The centre of the rhizome is off top, while the outer surface is off bottom

Bogbean stem, light micrograph
Bogbean stem. Light micrograph of a cross-section through the stem of a bogbean plant (Menyanthes trifoliata), showing its internal structure

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