An early Oligocene fossil acorn, associated leaves and pollen of the ring‐cupped oaks (<em>Quercus</em> subg. <em>Cyclobalanopsis</em>) from Maoming Basin, South China

Xiao-Yan Liu, Sheng-Lan Xu, Meng Han, and Jian-Hua Jin

J Syst Evol . 2019, (2): 153 -168 . DOI: 10.1111/jse.12450