Common Clubmoss, Elk-moss, Ground Pine, Running Clubmoss, Running PineStag's Horn Moss
Lycopodium clavatum
Synonyms: Lycopodium clavatum var. clavatum, Lycopodium clavatum var. integerrimum, Lycopodium clavatum var. integrifolium, Lycopodium clavatum var. subremotum

Common clubmoss as seen along the Cinnamon Trail along the ridgeline at the southern boundary to the Mount Saint Helens National Volcanic Monument...........September 28, 2014.
- 

Common clubmoss as seen along the Cinnamon Trail along the ridgeline at the southern boundary to the Mount Saint Helens National Volcanic Monument...........September 28, 2014.
- 
Common clubmoss observed in coniferous forest along the Shortcut Trail #171A, Indian Heaven Wilderness.....October 10, 2022.
- 
Common clubmoss observed growing amongst Viola sempervirens along the Sawtooth Mountain Trail #107 on the north side of Sawtooth Mountain, Indian Heaven Wilderness.....September 23, 2024.

Common clubmoss as seen along the Boundary Trail #1 east of Dark Meadows, Dark Divide, Gifford Pinchot National Forest..........July 3, 2015.
Paul Slichter