Forty moss taxa comprising 15 families were identified from 17 abandoned coalmines or exposed coal seams in western Pennsylvania. Aulacomnium palustre, Ceratodon purpure us, Dicranella heteromalla, and Pohlia nutans were most frequently collected. Pohlia nutans was observed in the harshest environments. Noteworthy, less frequently collected species included Barbula convoluta, B. indica, and Didymodon tophaceus.