Asia-Temperate: Taiwan (Taiwan present), Asia-Tropical: Philippines (Philippines present), Luzon present, Northern India present, S. China present
About 8 spp., Northern India to S. China, Taiwan; in Malesia: Philippines (Luzon).
Base chromosome number probably 36: C. auriculata tetraploid; C. omeiensis octoploid (n = c. 136; Kurita, J. Jap. Bot. 41, 1966, 176).
A very distinct genus which has no obvious near allies. The species C. auriculata is one of several ferns which are mainly distributed in Mainland Asia but have established themselves in Northern Luzon.