Looks like sun shock. Were these grown inside then placed out in the sun ?
Jim, is there any material left for pullings? I hope you did not loose anything not easily replaceable.
Freeze damage or sunburn would be my guess. Either a possibility?
I believe you sent me P. colimensis with our last trade. I believe it's still pretty small though. Rain check on that one and P. emarginata (newly received). I can help with the P. gracilis and P. gypsicola. I'll look and see what I have, I may be able to fill in a few other gaps as well. How do you feel about Mexi Ping seeds? I just collected some though I didn't write down what the exact cross is. I only know the one parent plant.
Hmmm, didn't realize your Pinguicula collection had downsized so. Time to send you back some more stuff.