Alocasia reginula, one of the "Jewels"
I put the fern in below the Alocasias and thought the whole setting warranted a photo. The Alocasias are in a curved, hollow log that's got a long hole on the outside of the curve. I put a whole lot of limestone gravel into the log which now is what you might call the "potting mix". The fern is also in a hollow log filled with old charcoal and some humus.
These Alocasias grow naturally in rainforest on limestone rocks or outcrops. Strictly speaking they're a lithophyte. They're one of a group of Alocasias called "Jewel Alocasias". When I originally bought some they were labelled "Alocasia". So the fern below fits in well, it's label just said "Fern". Sort of makes it like an orphans home, LOL.