Xanthoparmelia

Xanthoparmelia

Observation - Xanthoparmelia. Description: Different thalli on coastal rocks, so potentially different species, and I will split them if need be. Not sure I can go beyond genus without thin layer chromatography. These don't key out in Dobson because they lack isidia and are infertile, a combina

Different thalli on coastal rocks, so potentially different species, and I will split them if need be.

Not sure I can go beyond genus without thin layer chromatography. These don't key out in Dobson because they lack isidia and are infertile, a combination not allowed for. Smith et al. gets me to X. delisei, pulla or perrugata. In material from one thallus, the lower surface is black and under a stereomicroscope, the upper surface is strongly white-maculate.