It is also known for its ability to withstand high levels of solar radiation, changing salinity, and dessication.

[3] P. calophylla is found in cold temperate regions of the Northern Hemisphere, typically on coasts above the high tide line in the supralittoral zone[4]: 227  and in damp places inland, like moist soil, rocks, and trees in cold temperatures with humid climates.

[5]: 416 It has been reported in the United Kingdom[6] and in continental European cities like Innsbruck in Austria.

[8] P. calophylla has also been reported in parts of Antarctica, including streams in McMurdo Sound,[9]: 180  southern parts of Victoria Land on glacial walls,[10]: 194–195  and rarely in Ross island streams.

[11]: 88  However, more recent studies using gene sequences suggest the reports from Antarctica are a different species, not P.