Basionym Name:Arthonia gregarina Willey, Introd. Stud. Lich.: 53 (1887)
Homotypic synonyms:Arthothelium gregarinum (Willey) Zahlbr., in Engler & Prantl, Nat. Pflanzenfam., Teil. I (Leipzig) 1(1*): 91 (1903)Coniarthonia gregarina (Willey) Grube, Lichenologist 33(6): 496 (2001)