I believe Mahon nailed it! There appears to be a symbiotic relationship between the Live Oak and the orchid. I have also seen it on Cypress, but just not as frequently. I tried growing on fir bark and that was a disaster. So while cypress may be an alternative, I am against the "mining" of cypress and so will not consider that alternative. I know there are members of the Orchid board in Florida and Louisianna that can supply Live Oak bark
and we don't need to encourage destruction of the cypress forests that remain. JMO.
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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.)