English: Interrupted club-moss; Stiff clubmoss.
Synonym: Lycopodium annotinum.
Genus: 1 species.
Region: common and widespread; North America, Greenland, St. Pierre & Miquelon, Canada, Alaska, and mountains of the contiguous United States, Asia, China, Russia, Japan, Korea, Nepal, Assam; most of Europe.
Habitat: forests of the colder.

BotanyFern; clubmoss; spreading by means of horizontal stems running along the ground.
Stem: unbranched or sparingly branched, each branch containing a cone at the top.
Leaves have minute teeth on their edges.

TaxonomyThe genus Spinulum is accepted in the Pteridophyte Phylogeny Group classification of 2016 (PPG I). Other classifications submerge the genus in Lycopodium.