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Porina collinaOrange, Palice & Klepsland is described as new from siliceous rocks in the Czech Republic, Great Britain and Norway. The thallus produces isidioid propagules which resemble those inP. rosei,P. hibernicaandP. pseudohibernica, but which are more fragile and poorly-defined, and almost ecorticate; the perithecial wall is dark purplish brown and the ascospores are 3-septate. Sequences of the mitochondrial ribosomal DNA suggest that the new species belongs in thePorina byssophilaclade.

Opegrapha multipunctaandSchismatomma quercicolaare two sterile European lichens reproducing only vegetatively by means of soredia. RAxML and Bayesian analyses of newly generated sequence data from the mitochondrial ribosomal RNA small subunit provide clear evidence that these two species do not belong to the Arthoniomycetes, but to the Lecanoromycetes. In our phylogenetic analyses,O. multipunctais nested in the genusPorina(Porinaceae) as sister toP. austroatlantica, whileS. quercicolais nested in the genusSchizotrema(Graphidaceae) as sister toS. zebrinum. The following new combinations are introduced:Porina multipuncta(Coppins & P. James) Ertz, Coppins & Frisch andSchizotrema quercicola(Coppins & P. James) Ertz, Frisch & Sanderson.Schizotrema quercicolarepresents the first record of the genusSchizotremafor Europe and the first sorediate member in this genus. The species is newly recorded from Norway. The lichenicolous habit ofArthonia invadensis confirmed.