Scanning electron microscopy images [29–30].

Leaf epidermis of: A, Paradavallodes chingiae (Type E). B, Humata assamica (Type E). C, P. membranulosum (Type F). D, P. sp. (Type G). I, Davallia subsolida (Type C). J, H. trifoliata (Type C). K, H. repens (Type C). L, D. solida (Type D). Spores of: E, P. chingiae (verrucate/lophate). F, P. membranulosum (verrucate fused/porous.). G, P. kansuense (verrucae colliculate). H, P. multidentatum (verrucate discrete/fused).