This widespread northern species has been verified with colls. from only two western counties: FULT and MCRA (MUR). There is also a coll. of C.W. Short (at Univ. of Cincinnati or elsewhere) from Ky. (Short & Peter 1834; B, Gl), which needs to be checked. However, reports from Appalachian regions (M) have been based on misidentified colls. of lurida or lupulina: BELL at KY ( Anderson 1924); MCRE at MUR (Rogers 1941); ROCK at KY (F.T. McFarland in 1940). C. hystericina has been also been reported as far south as Tenn. (Ch), Miss. (K) and Ga. (W). Compared to lurida (and baileyi), hystericina (and comosa) can be distinguished as follows (FNA 23): perigynia with 12-25 veins (versus 5-12), confluent at mid-beak or below (versus nearly to beak apex); bodies elliptic to lance-ovate (versus elliptic to rotund); achense smooth (versus rough papillose).