Caloplaca isidiigera Vězda

Pechenga, Kandalakskiy Reserve, Bolshoy Aynov Island, alt. 20 m, 69.8355°N, 31.5691°E, on siliceous stone, 2010, A.V.Melekhin s.n. (KPABG, det. I. Frolov).

Rybachy Peninsula, coast NW from Guba Skorbeyevskaya Bay, shale cliffs in supralittoral zone, alt. 0–5 m, 69°55’13.4”N, 32°09’34.8”E; 4.9.2015. (IF1152 — sterile thallus). Observed only once together with Athallia scopularis and C. alcarum in the supralittoral zone. Remarks. — It was synonymised with C. chlorina (Wetmore 1997, Khodosovtsev et al. 2004), however Šoun et al. (2011) showed that this is a distinct species. In the Murmansk region, it was known from the Bolshoy Aynov Island (Vondrák et al. 2016a)