Parmotrema alidactylatum Estrabou & Adler, 1998
Diagnostic description:
Parmotrema alidactylatum is characterized by the adnate and eciliate thallus with pustules, and the presence of atranorin in the medulla (K+ yellow). Parmotrema soredioaliphaticum Estrabou & Adler is very close, but its pustules become sorediose (Estrabou & Adler 1998). This subtle difference could place P. soredioaliphaticum in the synonymy of P. alidactylatum (a hypothesis admitted by Estrabou & Adler 1998). Additional collections from Argentina and Brazil, together with the study of the types, could contribute to this question. [Spielmann & Marcelli 2009]