This name is a synonym of Physoceras mesophyllum (Schltr.) Schltr..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 53665) with original publication details: Beih. Bot. Centralbl. 34(2): 308 1916.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:625409-1.
This name was in version 1 of The Plant List, record kew-53665, and has not been changed.