Dacrymyces flavobrunneus sp. nov. and two new combinations in Dacrymyces Nees based on morphological and phylogenetic data

The class Dacrymycetes has two orders ( Dacrymycetales and Unilacrymales ), four families, and 13 genera, few of them with available molecular data and then usually of dubious delimitation. Dacrymyces Nees is a polyphyletic genus in Dacrymycetes and was introduced to accommodate one species, D. stillatus Nees, being characterized by a homogeneous composition of the intra-structure and an amphigenous or superior hymenium. In this study, neotropical specimens were added in the phylogeny of the Dacrymycetes , and as a result, Dacrymyces s.s. is emended to include species with resupinate basidiomata, unilateral hymenium, heterogeneous context, and absence of clamp connections. In this new delimitation, the new species Dacrymyces flavobrunneus sp. nov. is described using morphological and molecular data, two new combinations ( D. maxidorii comb. nov. and D. spathularia comb. nov.) are proposed based on DNA analyses, and previous combinations and new species ( Dacrymyces burdsallii , D. ceraceus , D. cereus , D. confluensunilateral , D. corticioides , D. grandii , D. grandinioides , D. lagerheimii , D. pulchrus , D. sobrius , and D. venustus ) are formally included in the genus circumscription.