This name is a synonym of Cerastium nigrescens (H.C.Watson) Edmondston ex H.C.Watson.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Student Fl. Brit. Isl. ed. 3: 60 1884.
This name was in version 1 of The Plant List, record kew-2709881, and has not been changed.