3 literature references for Gammiella rugosa Tixier, 1977:

Author: Hampe in C. Müller
Year: 1848
Title:
Source: Syn. Musc. Frond.
Author: Brotherus
Year: 1895
Title:
Source: Bih. Kongl. Svenska Vetensk.-Akad. Handl.
Author: Tixier
Year: 1977
Title:
Source: Rev. Bryol. Lichenol.