This name is a synonym of Hieracium lachenalii subsp. cruentifrons (Zahn) Zahn.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 5DBEFAC0-8ADB-4245-9C3B-1B3955AE28AD) with original publication details: "Zahn, in Candollea 2. 1924." 67 1924.
This name was in version 1 of The Plant List, record gcc-14675, and has not been changed.