Pyrgillus mammosus (Pyrenulaceae, lichenized Ascomycota), a new species from Taiwan

Pyrgillus mammosus, a new species from Xitou, Taiwan is described and illustrated. It is similar to P. tibellii and P. rufus but differs in its potassium hydroxide reaction of the thallus (K+ red) as a main distinguishing feature, additional chemical compounds detected by thin layer chromatography, and larger conical to hemispherical ascomata. Morphological and chemical differences among the closely similar taxa are discussed.

Automated summary

Pyrgillus mammosus, a new species from Xitou, Taiwan, is described and distinguished from similar taxa based on its thallus reaction, chemical compounds, and ascomata size.