From what I have learned, most of the rupiculous plants (spp and genera) grow in gravel-filled low spots in granitic or dolomitic rock areas exposed to high moisture, but drying overnight. I think you can tease many (like Sarcochilus) to grow in bark, but I think, for the most part, they want the free draining rocky detritous found in gravelly crevasses. Hope this helps.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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