DICT.TW Dictionary Taiwan
In·du·si·um n.; pl. Indusia 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.
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indusium
n : a membrane enclosing and protecting the developing spores
especially that covering the sori of a fern
[also: indusia (pl)]