This name is a synonym of Hieracium lachenalii subsp. juratzkanum (Zahn) Greuter.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record FB8D4B92-DD50-46F7-AB8B-E6C7B6564358) with original publication details: 368 1921.
This name was in version 1 of The Plant List, record gcc-69485, and has not been changed.