updated from Esslinger, T.L. Checklist of North American Lichens (v. 17)2012
WallaAPPposted 2022-06-20 18:17:07
Tuckerman died in 1886, so the collection date of 1950 (which comes from I-don't-know-where) is improbable at best. 1850 is likely, but absent some indication, that is merely speculative.