Basionym Name:Leptotrema crassum Müll. Arg., Flora, Regensburg 65(21): 332 (1882)
Homotypic synonyms:Ocellularia crassa (Müll. Arg.) Hale, Mycotaxon 11(1): 136 (1980)Rhabdodiscus crassus (Müll. Arg.) Frisch, in Frisch & Ohmura, Bulletin of the National Museum of Nature and Science, Tokyo, Series B (Botany) 38(3): 91 (2012)Stegobolus crassus (Müll. Arg.) Frisch, in Frisch & Kalb, Biblthca Lichenol. 92: 448 (2006)