Yet another update, and #1 (conventionally potted in bark) is definitely not happy....
#1 is all but dead--I finally removed the last few pseudobulbs from the bark and saucer and pinned them to the cork paludarium background in a tank. Lo and behold, a week later the near dead thing is perking up--bulbs are greener (they were olive green to brown before) and plump. No new growth, but no new leaf drop and better than what it looked like before I put it in the tank.
#2 (the piece with constant dampness and humidity) now has nice roots growing from the new leads that are starting to anchor it to the wood on the background. Both new leads are doing this and it is putting out another new growth. I'm starting to see why the sources I've read describe it as fast growing....
#3 (the piece on a cork background with just humidity)--definitely a new lead forming and the starts of tiny new roots. Not as happy as #2, but growing and doing far better than #1....
So, I've ended up putting #1 into similar conditions to #3 and it seems to be doing better. I picked up a Tolumnia/Onc. velutina this weekend with multiple pieces and plan to do a similar growth experiment when I repot it later this week....
Catherine
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catherinecarney 
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