KEY TO THE VARIETIES

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