This name is a synonym of Festuca filiformis Pourr..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25546528) with original publication details: Bull. Soc. Bot. France 125(1–2): 119 1978.
This name was in version 1 of The Plant List, record tro-25546528.