HPTLC plate in solvent C of quinoid pigment patterns of C. cinnabarinum (left), C. fallax (middle) and C. cuspidans (right) A before treatment with sulfuric acid and charring, and B under UV365 light before treatment with sulfuric acid and charring. Note the absence of A3 in C. cuspidans. The position of atranorin and norstictic acid is indicated. Several additional spots on the HPTLC plates under UV365 light have not been identified.