- Family: spikemoss (Selaginellaceae)
- Habitat: dry, thin, acidic soil on rock outcroppings, cliffs, and talus slopes
- Height: 1 to 2 inches
- Location of spores: in leafy, square-sided strobili at the top of stems
- Persistence: evergreen
- Origin: native
Photographed in the Delaware Water Gap region of Pennsylvania in late August.
This is typical habitat for rock spikemoss: on sparsely vegetated rocks. Photographed in the Delaware Water Gap region of Pennsylvania in late August.
Close-up of the square-sided strobili. In the strobilus in the center, it's just possible to see the yellowish-tan sporangia that contain the spores.