Abstract
<em>Parmelia serrana</em> A. Crespo, M.C. Molina &amp; D. Hawksw. is reported here for the first time from Poland. The species has been recorded from more than 20 localities and exclusively on the bark of trees. Its general distribution, habitat requirements, morphology, secondary chemistry are provided and the differences between this species and similar taxa, especially <em>P. saxatilis</em> and <em>P. ernstiae</em>, are discussed.
Highlights
The genus Parmelia Ach. occurs in the boreal-temperate Northern Hemisphere [1,2]
Parmelia serrana is morphologically and chemically very similar to P. saxatilis and apparently for many years considered as a chemical variant of the latter species [1]
Recent molecular data supported the recognition of P. serrana as a distinct taxon [9]
Summary
The genus Parmelia Ach. occurs in the boreal-temperate Northern Hemisphere [1,2]. It is characterized by foliose thalli, which are loosely to closely adnate to the substrate. Upper surface is smooth to foveolate, grey to brown-grey or grey-green, occasionally pruinose, with protoplectenchymatous and non-pored epicortex and always with usually elongated pseudocyphellae. Pustules or isidia as the vegetative propagules. Especially in the species, which reproduce by soredia or isidia, with brown or rarely blackish discs; ascospores are colorless, ellipsoidal to oval in shape [1,2,3,4,5]. All Parmelia species contain atranorin and chloroatranorin in the cortex, but a variety of secondary metabolites are present in the medulla, including lobaric, salazinic and protocetraric acids [3,5]
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