The first fossil Microsoroid fern ( Palaeosorum ellipticum gen. et sp. nov.) from the middle Miocene of Yunnan, SW China
Frédéric M. B. JACQUES, Tao SU, Zhe-Kun ZHOU
J Syst Evol . 2013, (6): 758 -764 .  DOI: 10.1111/jse.12030