Did you see the other photo of P. ornatum on Flora do Brasil Myriam? It shows the leaf stalk which has lots of red bumps on it.
http://floradobrasil.jbrj.gov....
I've gone through the list for Rio, P. ornatum is the only one which comes close! There's often unnamed species but in such a popular area you would think they had all been named by now.
There's a photo on MOBOT ..
http://www.mobot.org/mobot/pho...
