KEY TO THE VARIETIES

1	Lower pinnae not over 4 cm wide, lobed not more than ⅓ towards costae. 2
1'	Lower pinnae to 7 cm wide, lobed to 3 mm from costa Sphaerostephanos penniger var. excellens
2	Normal pinnae to 25 pairs, reduced pinnae 10-15 pairs Sphaerostephanos penniger var. penniger
2'	Normal pinnae 7 pairs; reduced pinnae 5 pairs Sphaerostephanos penniger var. karoensis