The presence or absence of the compound lichexanthone is a character used in classifying Pyxine species; about 20 species contain this compound. This represents the largest group of foliose lichens with the compound.[4]
^Kirk PM, Cannon PF, Minter DW, Stalpers JA (2008). Dictionary of the Fungi (10th ed.). Wallingford, UK: CAB International. p. 587. ISBN978-0-85199-826-8.
^ abAptroot, André; Jungbluth, Patrícia; Cáceres, Marcela E.S. (2014). "A world key to the species of Pyxine with lichexanthone, with a new species from Brazil". The Lichenologist. 46 (5): 669–672. doi:10.1017/s0024282914000231. S2CID85901115.
^ abcJungbluth, Patrícia; Marcelli, Marcelo Pinto (2011). "The Pyxine pungens complex in São Paulo State, Brazil". The Bryologist. 114 (1): 166–177. doi:10.1639/0007-2745-114.1.166. S2CID84464474.
^ abKalb, K. (1987). "Brasilianische Flechten. 1. Die Gattung Pyxine". Bibliotheca Lichenologica (in German). 24: 1–89.
^ abMongkolsuk, Pachara; Meesim, Sanya; Poengsungnoen, Vasun; Kalb, Klaus (2012). "The lichen family Physciaceae in Thailand—I. The genus Pyxine". Phytotaxa. 59 (1): 32–54. doi:10.11646/phytotaxa.59.1.2.
^ abcKashiwadani, H. (1977). "The genus Pyxine (lichens) in Papua New Guinea". Bulletin of the National Science Museum Tokyo. 3: 63–70.
^Awasthi, D.D. (1980). "Pyxine in India". Phytomorphology. 30: 359–379.
^Moberg, R. (1980). "Studies on Physciaceae (Lichens) 1. A new species of Pyxine". Norwegian Journal of Botany. 27 (3): 189–191.
^Kalb, K.; Archer, A.W.; Sutjaritturakan, J.; Boonpragob, K. (2009). "New or otherwise interesting lichens V". Bibliotheca Lichenologica. 99: 225–246.
^Nayaka, Sanjeeva; Upreti, Dalip K.; Ponmurugan, Ponnusamy; Ayyappadasan, Ganesan (2013). "Two new species of saxicolous Pyxine with yellow medulla from southern India". The Lichenologist. 45 (1): 3–8. doi:10.1017/s0024282912000618. S2CID85262248.