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Peter Tristram ... "Years ago T. ferreyrae was in the mix of Andean species on offer (usually not as that though) and it is a large, semi-xeric, tank species with typical flowers of the Andean tanks like rauhii - large, almost black flowers with stigma and stamen pretty-well equal to the petals. I doubt too many ferreyrae are around now to play with as it doesn’t seem to pup at any stage of growth, unless someone has it growing from seed (I hope so!).
The only scanned pic I have in my library of one I bloomed, is attached."