Two new species of Rhizoplaca (Lecanoraceae) from Southwest China.

In this study, two new species, Rhizoplacaadpressa Y. Y. Zhang & Li S. Wang and R.auriculata Y. Y. Zhang, Li S. Wang & Printzen, are described from Southwest China, based on their morphology, phylogeny and chemistry. In phylogeny, the two new species are monophyletic, and sister to each other within Rhizoplacachrysoleuca-complex. Rhizoplacaadpressa is characterized by its placodioid and closely adnate thallus, pale green and heavily pruinose upper surface, narrow (ca. 1 mm) and white free margin on the lower surface of marginal squamules, the absence of a lower cortex, and its basally non-constricted apothecia with orange discs that turn reddish-brown at maturity. Rhizoplacaauriculata is characterized by its squamulose to placodioid thallus, yellowish green and marginally pruinose squamules, wide (1-3 mm) and bluish-black free margin on the lower surface of marginal squamules, the absence of a lower cortex, and its basally constricted apothecia with persistently orange discs. Rhizoplacaadpressa and R.auriculata share the same secondary metabolites of usnic and placodiolic acids.

The phylogeny and taxonomy of Upretia (Caloplacoideae, Teloschistaceae), reveal three new species from Southwestern China.

Several specimens of Upretia from Southwest China are morphologically and phylogenetically distinct from currently recognized species in the genus. These specimens are here accommodated within a new species, Upretiazeorina Li J. Li & Printzen. It is characterized by an areolate to squamulose thallus with brown to blackish brown upper surface, pruinose, zeorine type apothecia, black discs, narrowly bacilliform conidia, and the production of gyrophoric acid. Two other specimens of Upretia from China are distinct from currently accepted species and tentatively referred to as Upretia sp. 1 and Upretia sp. 2. A key to all known species of Upretia is also provided.