Oak Root #1 is a photograph by Dr Keith Wheeler/science Photo Library which was uploaded on October 8th, 2019.
Oak Root #1
Oak root. Light micrograph of a section through a secondary root from an oak (Quercus sp.) tree. The primary cortex (outer layer) has been shed by... more
Title
Oak Root #1
Artist
Dr Keith Wheeler/science Photo Library
Medium
Photograph
Description
Oak root. Light micrograph of a section through a secondary root from an oak (Quercus sp.) tree. The primary cortex (outer layer) has been shed by the formation of a circular meristem, the periderm, which forms an outer layer of cork (phellum, black). Under the cork layer is a thin cortex (blue) and rings of several phloem layers (light blue) with patches of fibres (red). Next is the ring of cambium tissue (light blue), which contains an outer layer of phloem vessels and an inner layer of xylem (centre). The wood is classified as diffuse-porous, with large vessels and small cells of xylem parenchyma (light red). Six big rays (light blue) and small rays (blackish) of primary xylem tissue radiate from the centre. Magnification: x13 when printed 10
Uploaded
October 8th, 2019
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