1	Sporophylls dimorphic, dorsal sporophylls longer than ventral ones; megaspores reddish brown	S. ornata
–	Sporophylls monomorphic, dorsal sporophylls the same length as the ventral ones; megaspores whitish
2	Ventral leaf upper surfaces glabrous; basiscopic base slightly dilated; microspores yellow-orange	S. doederleinii
–	Ventral leaf upper surfaces scabrous; basiscopic base entire; microspore pale yellow
3	Leaves with obvious white margin (three cells wide); ventral leaves scabrous on upper surfaces only on the basiscopic halves (rarely also on upper halves); axillary leaves ovate	S. guihaia
–	Leaves without obvious white margin (only one cell wide); ventral leaves scabrous on upper surfaces throughout the leaf surface; axillary leaves narrowly ovate to triangular	S. trachyphylla