Little Dollar Lake peatland is a 14 ha, lake-fill, poor fen peatland complex on Michigan’s Upper Peninsula. Field studies over three years revealed the peatland to be composed of seven contiguous mats characterized by several habitats. These habitats included nararow floating mats; extensive grounded mats with hummock-hollow zonation dominated by Sphagnum spp., Chamaedaphne calyculata, and Carex oligosperma; and a lagg adjacent to the upland. Lagg habitats were dominated by Carex spp. and Calamagrostis canadensis. The bryophyte flora of the peatland was characterized by eleven species of Sphagnum that dominated the floating and grounded mats surrounding Little Dollar Lake. The total bryophyte flora (liverworts, peat mosses, and mosses) consisted of 36 species while the vascular flora (pteridophytes, gymnosperms, and angiosperms) consisted of 93 species.