This article deals with the botanical term indusium; for the geological level see Indusium (geology)
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In ferns , the indusium, or veil, is a thin ligament that covers the sorus (a collection of sporangia in which the spores mature). When the spores ripen, the indusium shrinks and falls off.
The shape or presence of Indusiums is an important feature in determining fern genera or fern families .
