World distribution: Cetraria andrejevii has a wide amphi-Beringian distribution, reaching the northeasternmost part of the Scandinavian peninsula (Kärnefelt 1979, Kärnefelt et al. 1993, Alstrup & Søchting 1986). In Europe it is restricted to Norway
Ecology: Results. The species occurred on soil on the ground in open situation in coastal heath on a small island. The microhabitat was mainly eroded soil in shallow pits dominated by Cetraria delisei. The aspects varied between northern and southern. The island was subjected to grazing by sheep and manuring by seabirds from a bird-cliff on the east end of the island. Discussion. The close association with Cetraria delisei indicates a preference for a periodically wet habitat and/or snow-beds. According to Kärnefelt (1979), the species is a weak competitor and most abundant in small wet tundra depressions
Threats: Results. Recorded threats were overgrowth by grasses (1), trampling (1), and collecting (1). Discussion. Close to the site for Cetraria andrejevii some areas had been fenced off apparently in order to protect some fields from grazing. If these areas are widened, some of the C. andrejevii-populations may be overgrown by grasses. The enclosures canalize visitors to the famous bird-cliff right through parts of the population. This may cause trampling damage to the specimens. As Store Ekkerøya represents the only known European site for C. andrejevii, collecting may also constitute a threat
Status: The species is known from one locality only. Some tens of specimens were observed; the most well-developed ones formed cushions up to 15 cm in diameter
Specimens in other herbaria, litterature, etc.