Key to the genera

1a. Horizontal stems present, sporophylls different from vegetative trophophylls, solitary or aggregated into erect or pendulous strobili  
2a. Strobili solitary or aggregated, stipitate Lycopodium
2b. Strobili solitary, sessile Lycopodiella
1b. Horizontal stems absent, sporophylls similar to vegetative trophophylls Huperzia

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith