Sphagnum mosses are small plants of the division of Bryophyta that are widespread and abundant in peatlands and several other types of wetlands. About sixty species of Sphagnum mosses are known for the territories of Quebec, Labrador and the Maritimes (with the exception of the island of Newfoundland). However, it can be laborious to identify these plants to the species taxonomic level. This book provides a unique dichotomous key for a visual identification of Sphagnum mosses