This name is a synonym of Quercus robur L..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 453780) with original publication details: Form. Querc. Croat. 22 1883.
This name record (from WCSP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Quercus pedunculata in version 1 of The Plant List.