Hi all,
I have an interesting Caloplaca. It looks very much like C. jungermanniae, except it's growing on rock. The spores are the right size, except the septum is too small. C. lactea has spores and septum that match but the rock it's on is basalt. Could basalt that has been in a lake bed and was under water until the 1920's or 30's become calcareous, or have calcareous qualities? A photo is in the gallery under orange Caloplaca.
Thanks