No, it's not a species name. Potinara is a hybrid consisting of (I think) Brassavola, Cattleya, Laelia and Sophronitis as parents ... maybe others too? They're usually listed as x Potinara:
http://garden.org/plants/searc... I don't know what the Mystere means and I couldn't find any information on a cultivar with the name of Natsumi.
