Brassavola Nodosa needs help

[euplusia]

Two observations: In Venezuela I´ve seen large clumps of Brassavola nodosa on an organ-pipe cactus in a semi-arid deserted hilly country.
In southern Brazil/Argentinia I´ve seen large clumps of Brassavola flagellaris growing in constant mist directly above the cascades of the waterfalls of Iguazu.
For cultivation of B. nodosa take a claypot, put in a trunk of grape or a piece of bark from cork (twice as long as the pot is high), mount the plant on top and let the roots find their way. No potting medium needed.