Parmotrema concurrens Hale, 1977
Diagnostic description:
Parmotrema concurrens is characterized by the isidiate thallus without maculae and the combination of salazinic acid, gyrophoric acid and hypoconstictic acid and allied in the medulla.
The similar P. ultralucens can be distinguished by the presence of lichexanthone (medulla UV+ yellow) and absence of gyrophoric acid. It also can resemble some saxicolous P. tinctorum (Nyl.) Hale with narrow lobes, although not related at all, since this last species is eciliate and has lecanoric acid.
(Spielmann 2009)