This name is a synonym of Pohlia wahlenbergii var. calcarea (Warnst.) E.F. Warb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 35119973) with original publication details: Trans. Brit. Bryol. Soc. 1(4): XVI 1950.
This name was in version 1 of The Plant List, record tro-35119973.