Bryophytes and lichens from the Dyken Pond Environmental Center in the Rensselaer Plateau region of eastern New York were inventoried from 1998 to 2020. Sixteen species of liverworts, 80 species of mosses and 53 species of lichens were identified. Two species of mosses are on the New York State Rare Moss List. A review of specimens listed from the Center on the Consortium of North American Bryophyte Herbaria (CNABH) showed seven additional species of mosses previously identified, but a review of the Consortium of North American Lichen Herbaria (CNALH) did not show additional species.