Basionym Name:Ascidium attenuatum C. Knight, Trans. Proc. N.Z. Inst. 15: 354 (1883)
Homotypic synonyms:Phaeotrema attenuatum (C. Knight) Müll. Arg., Bull. Herb. Boissier 2(app. 1): 74 (1894)Thelotrema attenuatum (C. Knight) Hellb., Bih. K. svenska VetenskAkad. Handl., Afd. 3 21(no. 13): 78 (1896)