indusium
noun
in·du·si·um
in-ˈdü-zē-əm
-ˈdyü-,
-zhē-
plural indusia
in-ˈdü-zē-ə
-ˈdyü-,
-zhē-
: an investing outgrowth or membrane
especially
: an outgrowth of a fern frond that covers the sori
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Merriam-Webster unabridged
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