A leaf is an organ of a vascular plant and is the principal lateral appendage of the stem. The leaves and stem together form the shoot. Leaves are collectively referred to as foliage, as in "autumn foliage". Although leaves can be seen in many different shapes, sizes and textures, typically a leaf is a thin, dorsiventrally flattened organ, borne above ground and specialized for photosynthesis. In most leaves, the primary photosynthetic tissue, the palisade mesophyll, is located on the upper side of the blade or lamina of the leaf but in some species, including the mature foliage of Eucalyptus, palisade mesophyll is present on both sides and the leaves are said to be isobilateral. Most leaves have distinctive upper surface (adaxial) and lower surface (abaxial) that differ in colour, hairiness, the number of stomata (pores that intake and output gases), epicuticular wax amount and structure and other features. Broad, flat leaves with complex venation are known as megaphylls and the species that bear them, the majority, as broad-leaved or megaphyllous plants. In others, such as the clubmosses, with different evolutionary origins, the leaves are simple, with only a single vein and are known as microphylls. Some leaves, such as bulb scales are not above ground, and in many aquatic species the leaves are submerged in water. Succulent plants often have thick juicy leaves, but some leaves are without major photosynthetic function and may be dead at maturity, as in some cataphylls and spines.
Sunset - Sunset among trees
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Added 2 months ago by erin

692 4

Tawulka arendsa - leaves, green, flowers, pink
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Tawulka arendsa

Added year ago by wieslawa


autumn stone - stone, leaves, plants, colors
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autumn stone

Added year ago by wieslawa


autumn house - house, leaves, autumn, bridge
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autumn house

Added year ago by wieslawa


Gold autumn - Beautiful Polish, golden autumn.
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Gold autumn

Added year ago by Marcin

302 1

Laweczka invites - Lazienka invites you for a moment of autumn reverie
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Laweczka invites

Added year ago by Ali Donka


Crowns of trees - Photography taken in the forest in autumn. Seeing the beautiful crowns of tall and stately trees. Le
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Crowns of trees

Added year ago by Aneta

94 1

Polish autumn - I am taking pictures of the beautiful Polish golden autumn
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Polish autumn

Added year ago by Anna