Transverse section through Iris root

Transverse section through Iris root

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Credit: JOHN DURHAM/SCIENCE PHOTO LIBRARY

Caption: Iris root. Light micrograph of a transverse section through the root of Iris germanica, the purple flag or London flag. At centre is a stele of vascular tissue, surrounded by the large- celled cortex (green). The stele contains an outer layer of cells known as the endodermis (white). Large metaxylem vessels (empty cells) are seen inside, with smaller protoxylem vessels (white) between the metaxylem and endodermis. Between the proto- xylem groups are phloem cells (dark green). The stele has a central pith. This vascular arrangement of cells is typical of monocotyledon- ous plants. Illuminated with partially crossed polarisers. Magnification: x100 at 35mm size.

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Keywords: botany, iris, iris germanica, light micrograph, monocotyledon, nature, plant, plants, root, roots, section, transverse, type, xylem

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