Selaginella rupestris, the northern selaginellla sometimes locally known as ledge spike-moss or rock spike-moss, is a species of spike-moss occurring in dry rocky places in eastern North America, including one locality in Greenland. It has a wide but sporadic range. In the absence of water, it rolls into a ball for which, it is also known as bird nest moss. Again, when it comes in contact with water, it opens up.
It is listed as imperiled and threatened in the State of Indiana.
- Nathaniel Lord Britton & Addison Brown - An Illustrated Flora of the Northern United States, Canada and the British Possessions, 2nd edition (1913)
- "Selaginella rupestris". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 9 November 2015.
- "Endangered, Threatened, Rare and Extirpated Plants of Indiana" (PDF). State of Indiana website.
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