1 | Basal basiscopic lobes of basal pinnae shorter than those next to them |
1' | Basal basiscopic lobes of basal pinnae elongate, longer than those next to them. |
2 | Stalks of basal pinnae c. 10 mm long |
2' | Stalks of basal pinnae much shorter, other pinnae mostly sessile |
3 | Pinna-lobes broad and obtuse; costae bearing stiff short hairs at least near their bases |
3' | Pinna-lobes acute, costae quite glabrous |
4 | Pinnae mostly short-stalked, their basal acroscopic lobes not or little overlapping the rachis; sinuses between pinna-lobes 2-3 mm wide |
4' | Pinnae (except the basal ones) quite sessile, their basal acroscopic lobes overlapping the rachis; sinuses between pinna-lobes very narrow |
5 | Basal basiscopic lobes of basal pinnae distinctly longer than the next lobes; pinna-lobes slightly toothed distally; basal acroscopic veins in larger pinnae twice forked |
5' | Basal basiscopic lobes of basal pinnae little longer than the next lobes; the pinna-lobes strongly crenate-serrate almost throughout; basal acroscopic veins in larger ones once forked |