Hi Mauro!
I bought it in "Orquidário da Mata" (Brooklin), they have a web site. In fact was a special order, Müller found it in a "species specialist" (?), his name Müller didn't said to me. It wasn't collected, it was in a plastic pot with tree fern fiber and crushed stones ('brita'), clearly cultivated.
NB: Looking at a book (Barros F, Kerbauy GB. Orquidologia Sul-americana: uma compilação científica. Instituto de Botânica, 2004 - a great book!) I think it's wrongly labelled; I guess it is Bifr. melanopoda or Bifr charlesworthii (vilosulla). The difference is in the callus in the lip (in melanopoda the callus is not divided, and in charleworthii is). Due the small size I simply can't see the callus! When I come back from Porto Alegre (next sunday) I wiil picture the remaing flowers (if remains some...) opening the lips (like an exsicata) and will send the pics to Campacci or Vittorino.
It's not clavigera because the petals aren't splanated (?there is this word for "esplanadas"?), but folded and parallel to the colunm (like charlesworthii and melanopoda)
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