Bryophytes were the first plants to conquer the terrestrial environment. Their preferred habitats are wetlands, such as lac Blanc (White lake), undergrowth, and peat bogs. Sphaignes are peat bog mosses. They are ground cover plants that gain territory through rhizoids, fixing filaments, rather than roots. The mosses are the only ones, with the blueberries and the lichens, able to thrive on the very acid grounds of the fir forests and the rocks of altitude.