Abstract
AbstractThe genusDendriscosticta(Ascomycota: Peltigerales) encompasses several distinctive lichen‐forming fungal species restricted to the Northern Hemisphere. Most are flagship species of old‐growth forests with good air quality. A global phylogeny of the genus based on multilocus sequence data (ITS,RPB1,EF‐1α,MCM7), model‐based phylogenetic methods, and morphological and chemical assessments, reveals a high level of cryptic speciation often associated with restricted geographical distribution and/or chemical characters. Using sequence‐based species delimitation approaches, we circumscribe two main clades referred to as theD. wrightiiclade, with five unequivocal species, includingD. gelidasp. nov., and theD. praetextataclade, with eight putative species, includingD. phyllidiatasp. nov. The absence of recently collected material ofD. hookericomb. nov. from the type locality unfortunately prevents assignment of this epithet to one of the five supported lineages sharing this morphotype. Three new combinations are proposed:D. hookeri,D. insinuanscomb. nov. andD. yatabeanacomb. nov. Epitypes are designated forD. wrightiiandD. yatabeana. Species diversity within the genus increased from four to nine. Our morphological assessment confirmed thatStictaandDendriscostictacan be readily distinguished by the presence of excipular algae whereas the structure of the lower surface pores is not a reliable diagnostic feature.
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