Sporangia in oblong sori under a reflexed tooth of a pinnule; indusium broad; rachis dark and shining.
The index reference for "pinnule" should probably be 59, rather than 66, but was not changed.
pinnule, a secondary division of a bipinnate or tripinnate leaf, 66.
The sori are in the form of lines which branch out from the lower part of the pinnule in a fan-shaped manner.
The sori are placed on small veins which grow outwards from the midrib of the pinnule.
They occur about midway between the central vein of the pinnule and the margin of the leaf.