Hypertext Webster Gateway: "Indusium"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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) A collection of hairs united so as to form a sort of cup,
and inclosing the stigma of a flower.
(b) 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.
(c) A peculiar covering found in certain fungi.
From WordNet (r) 1.7 (wn)
indusium
n : a membrane enclosing and protecting the developing spores
especially that covering the sori of a fern
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