This name is a synonym of Radula campanigera subsp. obiensis (S. Hatt.) K. Yamada.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 35205655) with original publication details: Bull. Tokyo Sci. Mus. 11: 83. f. 51 1944.
This name was in version 1 of The Plant List, record tro-35205655.