Parmotrema flavomedullosum Hale, 1974
Diagnostic description:
Parmotrema flavomedullosum is recognizable by the ciliate lobes, pustules fragmenting in soredia and the yellow to orange medulla with gyrophoric acid and secalonic acids A and C (K+ yellow, C+ orange, KC+ yellow).
Some other species of Parmotrema with yellow medulla can be distinguished as follow: P. araucariarum (Zahlbr.) Hale has eciliate lobes and the gyrophoric acid absent (Hale 1974), P.endosulphureum (Hillm.) Hale has eciliate lobes and produces isidia instead of soredia (Hale 1974). Finally, Parmelia elabens Kurok., described in 1974 based on specimens from Paraná State, is regarded a synonym of P. flavomedullosum by Fleig (1997), Hale & DePriest (1999) and Eliasaro (2001).
[Spielmann & Marcelli 2009]