The Dischidia will need a substrate, but can be trained to climb the background. They aren't true epiphytes. So you could plant it at the base, and then train it to go up the oak bark. Or, if you take my second suggestion about gluing the oak bark to the glass and stuff the concavity of it with sphagnum or substrate, you could plant it at the top and let it drape down over the bark. The Hoya would work the same way. They are closely related.
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Patty
Pahsimeroi, Idaho

Dendrobates: auratus blue, auratus Ancon Hill, tinctorius azureus, leucomelas. Phyllobates: vittatus, terribilis, lugubris. Epipedobates: anthonyi tricolor pasaje. Ranitomeya fantastica, imitator, reticulata. Adelphobates castaneoticus, galactonotus. Oophagia pumilio Bastimentos. (updated systematic nomenclature)

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