I believe the article you are thinking of is: Holttum, R.E. "The Ecology of Tropical Epiphytic Orchids." In Proceedings of the Third World Orchid Conference, London 1960, 196-204. London: Royal Horticultural Society, 1960.
It says that in epiphytes, although the velamen (the outer layer of exposed roots) can absorb small amounts of water, that water is never passed on to the interior of the root where it can be utilized by the plant. Absorption of water and nutrients is limited to the areas of the roots growing in contact with the substrate. --Stephen ======= Stephen Manza [EMAIL PROTECTED] http://www.slipperorchids.info/ _______________________________________________ the OrchidGuide Digest (OGD) [email protected] http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
