Pohlia nutans, the nodding thread-moss, is a species of moss in the family Mniaceae.

[3] It has a cosmopolitan distribution, found on all seven continents; Europe, Iceland, Siberia, Japan, North America, Greenland, the Andes of South America, South Africa, Tasmania and nearby mainland Australia, New Zealand, and the Antarctic Peninsula and Mount Rittmann in Antarctica.

[4] An extremophile, it is resistant to cold, drought, salt, acid, heavy metals, and intense UV radiation.

[5][6][7][8] Pohlia nutans is subject to fungal infections which cause fairy rings to appear.

Some causative agents have been identified, including species of Cladosporium, Mortierella gamsii and Mortierella fimbricystis.