Spinulum annotinum, synonym Lycopodium annotinum, known as interrupted club-moss,[1] or stiff clubmoss,[2] is a species of clubmoss native to forests of the colder parts of North America (Greenland, St. Pierre & Miquelon, all 10 provinces and all 3 territories of Canada, Alaska, and mountains of the contiguous United States),[3] as well as Asia (China, Russia, Japan, Korea, Nepal, Assam),[4] and most of Europe.

[8] Spinulum annotinum is a common and widespread club-moss spreading by means of horizontal stems running along the surface of the ground.

[6] In Finnish traditional medicine Spinulum annotinum has been used as a remedy for rickets.

The plant's spore dust has also been used as medicine for rashes and inflammation.

The spore dust or lycopodium powder has also been used as 'fly gunpowder' (kärpäsruuti in Finnish) due to the oily and easily flammable nature of the spores.