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Answer for the clue "A membrane enclosing and protecting the developing spores especially that covering the sori of a fern ", 8 letters:
indusium

Word definitions for indusium in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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.) A collection of hairs united so as to form a sort of cup, and inclosing the stigma of a flower. ...

WordNet Word definitions in WordNet
n. a membrane enclosing and protecting the developing spores especially that covering the sori of a fern [also: indusia (pl)]

Wiktionary Word definitions in Wiktionary
n. A protecting membrane, especially that covering the developing spores of a fern

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.