The morphologically deviating genera Omphalodiella and Placoparmelia belong to Xanthoparmelia (Parmeliaceae)
The monotypic genera Omphalodiella and Placoparmelia were described from Patagonia (Argentina). The latter is characterized by placodioid species, morphologically similar to some subcrustose, brown Xanthoparmelia species, whereas Omphalodiella is a peltate lichen. Analyses of ribosomal DNA sequences supported their placement in the parmelioid clade. Both genera are nested within Xanthoparmelia. Affinites to the latter genus are congruent with the presence of Xanthoparmelia-type lichenan in the...[Show more]
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