This name is a synonym of Eleocharis mamillata subsp. austriaca (Hayek) Strandh..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 242740) with original publication details: Práce Morav. Prír. Spolecn. 5: 50 1929.
This name was in version 1 of The Plant List, record kew-242740, and has not been changed.