| Blc. is short for Brassiolaeliacattleya which is an intergeneric hybrid between plants of the following genus: Brassavola, Laelia, and Cattleya.
I'm sorry to say the rest of your tag looks a little messed up, possibly not complete. Also this hybrid may no longer be a Blc. Some orchid species' generic names (their genus) have been changed which with change the names of hybrids made wiht them.
__________________  |