This name is a synonym of Rhytidophyllum exsertum subsp. villosulum (Urb.) Borhidi.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50261383) with original publication details: Bot. Közelem. 62(1): 27 1975.
This name was in version 1 of The Plant List, record tro-50261383.