Yep, definitely a Punctelia. You often need to check the colour of the underside of the lobes when trying to determine the species, and whether the medulla reacts pink, red, or not to C.
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1/1 Hi! C is a hypochlorite - probably calcium originally (Ca(OCl)2) (hence the abbreviation, C) - you can get some from Ebay and mine works well. Many people use domestic bleach, which contains sodium hypochlorite (NaOCl) - make sure there's no sodium or potassium hydroxide in the bottle (KOH) -
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