Currently, my favorite terrarium orchid is Trichosalpinx rotundata. This is an odd ball from Costa Rica. The leaves are perfectly round, about the size of quarters and cupped. The tiny flowers appear under the leaves in the cup. This actually makes sense because insects seek shelter under the leaves during the frequent heavy rains -- hence pollination! The flowers are near microscopic, but new leaves emerge a really lovely copper color that rivals many flowers. I am getting about one new leaf a week since putting my two plants in the terrarium. I am also having good luck with Lepanthes Calodictyon. This is very small plant that you see at shows for what seems like a lot of money for a plant that would set comfortably on a silver dollar. But now that I am getting lots of new leaves and flowers (tiny again), it seems worth it. I think both these plants meet R Srinivasan's criteria for good terrarium orchids.
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