Abstract
One hundred and seventy-seven species of mosses are reported from the St. Pierre and Miquelon archipelago, off the south coast of Newfoundland. Of these, 54 species were not previously known from the archipelago. All earlier reports have been evaluated, and most have been confirmed or revised. The moss flora is predominantly composed of species that are widespread in Newfoundland. However, a number of mosses which occur in St. Pierre and Miquelon have a Newfoundland distribution restricted to the northwestern part of the island. Among the species that are widespread in St. Pierre and Miquelon is Antitrichia curtipendula, which was known in eastern North America only from a few localities. In southeastern Newfoundland, it is more frequent than was formerly thought; its distribution in the region is mapped.
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