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See DI02/14: A Key to Tillandsia subgroup diaphoranthema.
Ray Clark ... "from Derek Butcher a while ago, from my notes its possible that its origins may go back to Walter Til, (WT42)?
|Ian Hook 07/11
||Ray Clark 01/15
From FCBS .... "There are several groups within Tillandsia and some may be raised to generic status.
One of these groups contains the very small Tillandsias and are called Diaphoranthema, with the world authority being Dr Walter Till.
Dr. Till does most of his publishing in the German Journal 'Die Bromelie'. His main paper on Diaphoranthema is in Selbyana 13; 88-94 1992.
The 1st group proposed in Diaphoranthema is the CALIGINOSA Group.
This group includes T. caliginosa, cotagaitensis, porongoensis, and tenebra."