Six new species of Arthrinium from Europe and notes about A.caricicola and other species found in Carex spp. hosts

Abstract. Several new Arthrinium specimens were collected from various locations in Mediterranean and temperate Europe. A collection of the type species, A.caricicola, was obtained from dead leaves of Carexericetorum in Berlin. Sequences of four genetic markers, ITS, 28S rDNA, tef1 and tub2 were produced from almost all collections and analyzed with those available in public databases. Results are employed to support six new species: A.balearicum, A.descalsii, A.esporlense, A.ibericum, A.italicum and A.piptatheri. The type species, A.caricicola, is related to other species occurring on Carex sp.; these might represent an independent lineage from Apiospora and the remaining species of Arthrinium. Finally, the sexual morph of A.marii is described and illustrated for the first time.