KEY TO THE VARIETIES

1	Pinnae lobed at least ⅓ towards costa. 2
1'	Pinnae crenate Sphaerostephanos pterosporus var. crenatus
2	Pinnae lobed less than ½ towards costa; basal pair of veins often anastomosing Sphaerostephanos pterosporus var. pterosporus
2'	Pinnae lobed 3/5-⅔ towards costa; basal veins rarely anastomosing. Sphaerostephanos pterosporus var. altilobus