ABSTRACT This is the first checklist of Maine mosses since the publication of the state bryoflora, Maine Mosses . The checklist lists and ranks the 455 taxa of mosses that have been collected in Maine. This includes collections cited in Maine Mosses and/or the Tropicos Database of the Missouri Botanical Garden (denoted by M ). These collections have been verified by Bruce Allen, Lewis Anderson, or Richard Andrus. Literature reports cited in Maine Mosses are denoted by m . Also included are collections in the database of the Consortium of North American Bryological Herbaria (denoted by r ). The identity of these latter collections is mostly unverified with the exception of the Sphagnum . An * denotes species not yet found in Maine but expected to occur there.