To remove or shed an indusium, which is a membrane or covering structure found in certain plants and fungi.
From Latin ex- (out) combined with indusium, a botanical term referring to protective membranes. The Latin indusium itself comes from induere (to put on), as these structures 'clothe' or cover the reproductive organs of plants.
Ferns use an indusium like an umbrella over their spore-producing structures—exindusiate describes when they shed this protective covering. It's one of those wonderfully specific scientific words that shows how ferns have their own tiny engineering systems!
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