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The Collaborative International Dictionary
Indusium

Indusium \In*du"si*um\, n.; pl. Indusia (-[.a]). [L., an under garment, fr. induere to put on: cf. F. indusie the covering of the seed spots of ferns.] (Bot.)

  1. A collection of hairs united so as to form a sort of cup, and inclosing the stigma of a flower.

  2. The immediate covering of the fruit dots or sori in many ferns, usually a very thin scale attached by the middle or side to a veinlet.

  3. A peculiar covering found in certain fungi.

Wiktionary
indusium

n. A protecting membrane, especially that covering the developing spores of a fern

WordNet
indusium
  1. n. a membrane enclosing and protecting the developing spores especially that covering the sori of a fern

  2. [also: indusia (pl)]

Usage examples of "indusium".

The sori are on the upper half of the frond, at the back of the pinnules, in round masses towards the base of the segments, covered with a conspicuous, kidney-shaped indusium.