VONDRÁK, J. & MAYRHOFER, H. 2013. Caloplaca anularis and Caloplaca scrobiculata are distinct.— Herzogia 26: 21–29.

Caloplaca anularis, described from the Western Alps, and Caloplaca scrobiculata, described from Central Asia, are distinct species. The main differences are the shape of the thallus margin, the anatomy of the thalline cortex, characters of the algal layer and the ascospores. Caloplaca anularis is a widespread lichen known from mountain ranges in Europe (Alps, Carpathians, Balkan Peninsula), Near Asia (continental Turkey and Caucasus) and Central Asia (Altay, Karakorum, Hengduan Shan). The specimens from Central Asia differ slightly from the European specimens in thallus and medulla thickness, but we consider this difference environmentally induced and taxonomically insignificant. Caloplaca scrobiculata is restricted to arid mountain ranges of Central Asia. The Central Asian Caloplaca bohlinii does not differ significantly from C. anularis. The new combination Caloplaca anularis f. ignea is made for specimens of C. anularis with a red thallus.