Tinted SEM of Quercus robur.

Tinted SEM of Quercus robur.

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Caption: False-colour scanning electron micrograph of a vertical section through oak heartwood, the wood (secondary xylem) of Quercus robur. The large, vertical tube-like structures are tracheary vessels which have become blocked by bladder-like ingrowths known as tyloses. In young sapwood the vessels carry water & nutrients from the roots to the leaves, but after a few years they become blocked & no longer carry sap. The large vessels occur in early (spring) wood; the smaller tubes seen on the right of the photo are late-wood vessels. The compact tissue separating the two types of wood is part of the tree's ray system. Oak is graded as a hardwood. Mag: x8 at 35mm size.

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Keywords: botany, hardwood, heartwood, nature, oak, plant, plants, quercus robur, ray, tylose, vessel, wood

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