INDUSIA
INDUSIUM
indusium
(noun) a membrane enclosing and protecting the developing spores especially that covering the sori of a fern
Source: WordNet® 3.1
Noun
indusia
plural of indusium
Source: Wiktionary
INDUSIUM
In*du"si*um, n.; pl. Indu. Etym: [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.
Source: Webster’s Unabridged Dictionary 1913 Edition