TY - J Syst Evol A1 - Hong-Mei Liu, Eric Schuettpelz, and Harald Schneider T1 - Evaluating the status of fern and lycophyte nothotaxa in the context of the Pteridophyte Phylogeny Group classification (PPG I) Y1 - 2020-11-01 JF - Journal of Systematics and Evolution JO - J Syst Evol SP - 988 EP - 1002 VL - 58 IS - 6 UR - https://www.jse.ac.cn N1 - 10.1111/jse.12641 ER -