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5 Santesson R, "The lichens and lichenicolous fungi of Sweden and Norway" Svensk Botanisk Tidskrift 1993
6 Burgaz AR, "The genera Koerberia, Leptochidium, Massalongia and Polychidium (Peltigerales sensu lato) in the Iberian Peninsula" 73 : 381-392, 2001
7 Ryan BD, "Polychidium, In Lichen Flora of the Greater Sonoran Desert region. Vol. 1" Lichens Unlimited, Arizona State University 401-402, 2002
8 Kurokawa S, "Parmelioid lichen genera and species in Taiwan" 77 : 225-284, 2001
9 Xiao YQ, "Notes on the lichen genus Polychidium from China" 5 : 53-57, 2006
10 Aptroot A, "New Taiwan macrolichens" 84 : 281-292, 2002
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