Black, sterile, areolate crust

Black, sterile, areolate crust

Observation - Black, sterile, areolate crust. Description: Black, sterile, areolate crust on siliceous rock in boggy habitat near river. The photobiont is a green alga. I was wondering about Caloplaca chlorina, but can't discern any isidia and don't get a K+ violet reaction (more of a yellow-brown - presumably a

Black, sterile, areolate crust on siliceous rock in boggy habitat near river. The photobiont is a green alga. I was wondering about Caloplaca chlorina, but can't discern any isidia and don't get a K+ violet reaction (more of a yellow-brown - presumably a pigment dissolving in the K).