See M and Abbott et al. (2001) for detailed notes. E. laevigatum A. Braun (= E. kansanum J.H. Schaffn.) is a western species that has been reported from Ky., but no colls. are confirmed (M). The hybrid with praealtum ( X ferrissii) is more widespread than pure laevigatum in North America, and behaves as a speciesl it is probably confused with praealtum in many cases (FNA 2, W). The related northern (circumboreal) species, E. variegatum Schleich. (or its hybrid with E. laevigatum), has also been reported from Ky. but probably in error (M).