Sunken stomata in Pinus (Gymnopsermae)

Photo Google Wikimedia Commons
Cross section: Pinus needle magnification: 400x
A single layered epidermis of lignified cells is covered by a heavy waxy cuticle. Numerous sunken stomata are scattered over the entire epidermal surface. They are bounded by pairs of subsidiary cells, and open internally to a sub-stomatal cavity and externally to a respiratory cavity or vestibule.
The underlying hypodermis consists of several layers of thick-walled sclerenchyma, particularly well-developed at ridges.

10 February 2014, Berkshire Community College Bioscience Image Library

3,264 × 1,840 (5.58 MB)

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Published by

Willem Van Cotthem

Honorary Professor of Botany, University of Ghent (Belgium). Scientific Consultant for Desertification and Sustainable Development.

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