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Transverse section through the aerial root of an epiphytic orchid

Legend:

1 velamen
3  vascular cylinder
2  cortex

English name: Orchid
Scientific name: Oncidium sp.
Familia: Orchidaceae
Classis: Monocotyledonas
Phylum: Angiospermae
Regnum: Plantae

The thick cell walls of the velamen also give mechanical protection for the cortex. The velamen also plays a role in water absorption.

http://www.vcbio.science.ru.nl/en/image-gallery/show/print/PL0272/print/

last modified: 5 Jun 2014