Photographed at the type locality, and so far only known location for this species on the Chatham Islands. When I last visited this site on the 2 of December 2008 (see https://inaturalist.nz/observations/1346329) Caloplaca maculata was locally common at this location. On this visit the population had declined by 98%, I suspect because of ongoing erosion of the soft volcanic tuff rock it grows on - the site is very exposed, and subjected to wave wash.

So far I have not seen any further populations on the Chatham Islands.

This species is otherwise only known from one location near Akatore, south of Dunedin, South Island, New Zealand, where it is not very common either.