.: A new proposal for placement of the resinicolous genus ().

Resinicolous fungi constitute a heterogeneous assemblage of fungi that live on fresh and solidified plant resins. The genus includes, according to current knowledge, two species, and . In contrast to other resinicolous discomycetes, which are placed in genera also including non-resinicolous species, species only ever fruit on resin. The taxonomic classification of has proven to be difficult and currently the genus, provisionally and based only on morphological features, has been assigned to the (). In contrast, molecular studies have noted a possible affinity to the . Here we review the taxonomic placement of using sequence data from seven phylogenetically informative DNA regions including ribosomal (ITS, nucSSU, mtSSU, nucLSU) and protein-coding () regions. We combined available and new sequence data with sequences from major classes, especially and , and assembled three different taxon samplings in order to place the genus within the . Based on our data, none of the applied phylogenetic approaches (Bayesian Inference, Maximum Likelihood and Maximum Parsimony) supported the placement of in the or any other order in the . A placement of within the is similarly unsupported. Based on our data, forms an isolated and highly supported phylogenetic lineage within the "". From the results of our multilocus phylogenetic analyses we propose here a new class, order, and family, , and in the to accommodate the genus . The genetic variability within the newly proposed class suggests that it is a larger group that requires further infrageneric classification.