Three New Species and a New Record of the Lichen Genus (Peltulaceae) from Helan Mountain in China.

In this study, a systematic taxonomic analysis was carried out on the lichen genus , collected from Helan Mountain in China; three new species (, , and ) and a new record ( (Nyl.) Egea) for China were identified. Four species were identified by morph-anatomical, chemical, and phylogenetic analyses by combining two gene loci (ITS and LSU). is with tiny individual thalli up to 1mm, attached by creamy-white cylindrical rhizoids and apothecia filling the whole squamule. is characterized by thallus squamulose forming rosette-shaped patches and squamules with distinctive thickened margins. is characterized by brownish brown thallus and squamules with densely reticulate upper surface. is characterized by irregular squamules attached to a tuft of hyphae. The four species are described in detail, compared, and discussed with similar species, and images of morpho-anatomical structures of the four species are also provided. Moreover, a key to the species of from Helan Mountain is provided. The results enrich the data of the genus and also indicate that the rich diversity of lichen species in Helan Mountain is worthy of in-depth study.