The sori are quickly confluent, and all trace of the indusium is soon lost.
The sori are narrow, and when young are covered with an indusium.
Short, indusium usually more or less curved and frequently crossing a vein.
The indusium is orbicular-reniform, and almost always smooth.
The indusium is cleft down the middle, so as to form a longitudinal fissure or suture.
Rarely the sinus is so deep that the indusium at last becomes divided.
Sporangia in oblong sori under a reflexed tooth of a pinnule; indusium broad; rachis dark and shining.
indusium, the shield or covering of a fruit-dot of a Fern, 159.
Thus it is proper to describe the shape of the indusium as peltate.
Sporangia on a continuous line; fronds large, ternate; indusium narrow.