Molecular phylogenetic evidence revealed inappropriate classifications for two species once placed in this genus, A. insignis(P.M.Jørg. & Tønsberg) Ertz and A. borbonicaMagain & Sérus.; they were formally transferred to the genus Gabura in 2020. Arctomia fascicularis(L.) Otálora & Wedin (2013) was confirmed to belong to Gabura,[4] a generic placement originally proposed by Per Magnus Jørgensen in 2014.[5]
^Magain, Nicolas; Spribille, Toby; DiMeglio, Joseph; Nelson, Peter R.; Miadlikowska, Jolanta; Sérusiaux, Emmanuël (2020). "Phylogenetic evidence for an expanded circumscription of Gabura (Arctomiaceae)". The Lichenologist. 52 (1): 3–15. doi:10.1017/s0024282919000471. hdl:2268/245664. S2CID216509253.
^Jørgensen, Per M. (2014). "Taxonomy and nomenclature of Collema fasciculare (L.) G. H. Weber". The Lichenologist. 46 (4): 594. doi:10.1017/s0024282914000140. S2CID232398552.