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Peter, I do not remember the source either,
but I believe the statement was made in reference to Vanilla roots. If
indeed this is true for Vanilla roots, that does not make it true for all orchid
roots.The notion, expressed in many orchid books, that there are only two kinds
of orchid roots is false. The large
diversity of orchid root velamen structures must have a practical
reason.
Orchidaceae spp roots have the ability to
adapt to their environment and substrates. Why should it have
stopped at orchid flowers, adapting to pollinators in their
habitat? >Peter O'Byrne who said:
>BTW Stephen, although Holttum's quotation says that
little of the
>water absorbed by the velamen is passed to the interior of the root, >it DOESN'T say "absorption of water and nutrients is limited to the >areas of the roots growing in contact with the substrate." Perhaps >that came from some other source ? |
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