United States, Minnesota, Cook, Boundary Waters Canoe Area Wilderness, Rugged bedrock terrain along the Border Route Hiking Trail, 24 miles north of Grand Marais. T65N R1E SE1/4 of SW1/4 of NE1/4 Sec. 21, SW1/4 of SE1/4 of NE1/4 Sec. 21
Occasional on a large north-facing cliff on the upper portion of the steep 350-foot slope above the west end of Watap Lake. Scattered clumps on Rove Formation sedimentary rocks on the lower half of what is locally a 75-foot cliff (much taller to the west), none on upper cliff diabase. In thick mats of Hylocomium splendens, Pleurozium schreberi, and Polytrichum sp. Shaded by Thuja occidentalis and Betula papyrifera. ["probably H. selago" - W. Testo, 2014]
Associates include Huperzia selago, H. appalachiana, Polypodium virginianum, Woodsia ilvensis, Gymnocarpium jessoense, Poa glauca, Sorbus decora.