A perennial from the group of ferns, it grows 5 to 30 cm tall. The stem is densely covered with dark green to yellow-green, linear-lanceolate leaves. The sporangia grow individually at the nodes (branching points) of the middle and top leaves. Spores are formed from August to September. In our country, Fir Clubmoss grows in the border mountains in Northern and Northeastern Moravia. It is a toxic plant.