This project uses intensive sampling of RAD sequences (RAD-seq) to test for the role of geographic distance, both between and within continents, on population structure within species of the Sphagnum capillifolium complex that has circumboreal distributions. Other objectives include the clarification of species with uncertain taxonomic status within the S. capillifolium complex, and the inference of the phylogeny of Sphagnum subgenus Acutifolia.