New species and records of Pyxine (Caliciaceae) in China.

Mei-Xia Yang,Li-Song Wang,Yan-Yun Zhang,Dong Liu,Christoph Scheidegger,Li-Juan Li,Xin-Yu Wang,An-Cheng Yin

doi:10.3897/mycokeys.45.29374

Abstract

In this study, the diversity of Pyxine Fr. in China was assessed based on morphological and chemical traits and molecular data are inferred from ITS and mtSSU sequences. Nineteen species were recognised, including three that are new to science (i.e. P.flavicans M. X. Yang & Li S. Wang, P.hengduanensis M. X. Yang & Li S. Wang and P.yunnanensis M. X. Yang & Li S. Wang) and three records new to China were found (i.e. P.cognata Stirt., P.himalayensis Awas. and P.minuta Vain.). Pyxineyunnanensis is diagnosed by the small size of the apothecia, a white medulla of the stipe and the presence of lichexanthone. Pyxineflavicans is characterised by broad lobes, a pale yellow medulla of the stipe and the presence of atranorin. Pyxinehengduanensis can be distinguished by its pale yellow medulla, marginal labriform soralia and the absence of atranorin. Detailed descriptions of each new species are presented, along with a key to the known species of Pyxine in China.

Highlights

The lichen genus Pyxine was first established by Fries (1825)
Nineteen species were recognised, including three that are new to science
Nineteen Pyxine species were confirmed in China, including three species new to science and three species hereby newly reported for the country, based on the following characteristics: presence of isidia and soredia, colour of the medulla, main compounds, reaction of K on the internal stipe of apothecia, nature of the substrate and colour of the thallus

Summary

Introduction

The lichen genus Pyxine was first established by Fries (1825). Molecular data support the placement of Pyxine in a clade of taxa that were previously placed in Physciaceae and the circumscription of the family has changed to Caliciacese (Wedin and Grube 2002; Crespo et al 2004; Gaya et al 2012; Prieto and Wedin 2017). Nineteen Pyxine species were confirmed in China, including three species new to science and three species hereby newly reported for the country, based on the following characteristics: presence of isidia and soredia, colour of the medulla, main compounds, reaction of K on the internal stipe of apothecia, nature of the substrate and colour of the thallus.

Results

Conclusion