This name is a synonym of Homalothecium nuttallii (Wilson) A. Jaeger.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 35154182) with original publication details: Bull. Torrey Bot. Club 17: 277 1890.
This name was in version 1 of The Plant List, record tro-35154182.