KEY TO THE VARIETIES

1Stipe-scales 10 mm long; acicular hairs on lower surface of costae to 0.5 mm long.
1'Stipe-scales to 18 mm long; acicular hairs on lower surface of costae 1 mm long
2Acicular hairs present on lower surface of rachis and costae.
2'Hairs on lower surface of rachis and costae not acicular