Lycopodium hickeyi, Hickey's tree club-moss or Pennsylvania clubmoss, is North American a species of clubmoss in the family Lycopodiaceae. It is native to eastern and Central Canada (from Newfoundland to Ontario with isolated populations in Saskatchewan) and the eastern and north-central United States (from Maine west to Minnesota and south as far as Tennessee and North Carolina). Lycopodium hickeyi is very similar to L. obscurum except for a few minor but consistent features: side shoots round rather than flat in cross section, leaves all the same size.