Data from: Parmotrema internexum (Lecanorales: Parmeliaceae): an overlooked macrolichen in southeastern North America highlights the value of basic biodiversity research

Parmotrema internexum is shown to be a morphologically, chemically and
phylogenetically distinct species whose occurrence in North America has
been previously overlooked and largely based on misidentifications. Prior
accounts of the species being similar to P. crinitum but differing in
having an adnate thallus, few marginal cilia, and in producing
norlobaridone in addition to the stictic acid complex, are confirmed. An
extensive review of the taxon, including the use of the name P. internexum
in the literature, is provided. Taxonomic treatments of P. crinitum and P.
internexum are also provided and both species are illustrated.