In Québec, the genus Ptychostomum (family Bryaceae) counts 10 species of mosses. The stars? Tight-tufted Thread-moss, Marsh Bryum and Black-spored bryum, the most often observed. The richest region: Côte-Nord, with 4 species. Every species has its own page: photos, its season, its habitat and the best places to see it near you.