A moss-like plant. Leaves: scale-like, many-ranked, uniform, lanceolate, acute, lax, spreading. Spikes: solitary at the ends of the fertile branches.
This plant has creeping, sterile branches, and erect, fertile ones with tiny, spreading leaves, and large, elongated spikes at their ends.
Selaginella rupestris, or Rock Selaginella, has densely tufted stems, stiff imbricated leaves, and quadrangular spikes terminating the branches.