1	"Rhizome bearing bristles but not scales"	Taenitis
1	"Rhizome bearing scales, sometimes hairs also present"	2
2	"Sori borne only on a reflexed modified flap of lamina (soral flap)"	Adiantum
2	"Sori superficial, marginal or submarginal, sometimes covered by a reflexed flap of lamina, but not borne on that flap, or protected by a marginal indusium"	3
3	"Sori superficial, borne along the length of the veins, exindusiate"	4
3	"Sori marginal or submarginal, continuous or interrupted"	5
4	"Lamina herbaceous to thinly coriaceous; abaxial surface usually with a white or golden yellow waxy coating"	"Pityrogramma {Pityrogramma calomelanos}"
4	"Lamina membranous to thinly herbaceous; abaxial surface lacking a coloured waxy coating"	"Anogramma {Anogramma leptophylla}"
5	"Sorus concealed by a dense covering of scales"	Paraceterach
5	"Sorus not protected by scales, but sometimes concealed by reflexed pinna margin, or by a marginal indusium"	6
6	"Pinnae deciduous, abscissing at the junction with the subtending stalk or rachis"	Pellaea
6	"Pinnae (or lobes of pinnatifid fronds) not deciduous"	7
7	"Lamina pinnately arranged, 2-pinnate, sometimes 3-pinnate at base"	8
7	"Lamina tripartitely or pinnatifidly arranged"	9
8	"Primary pinnae in upper part of frond and apical pinnules of primary and secondary pinnae in lower part of frond commonly hastate"	"Pellaea viridis"
8	"Primary pinnae and apical pinnules of primary and secondary pinnae never hastate"	Cheilanthes
9	"Lamina simple and cordate to pedate, or palmate (when 1–3-pinnatifid)"	Doryopteris
9	"Lamina regularly pinnatifid, at least 1-pinnate-pinnatifid"	Cheilanthes