from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An enclosing membrane, as that covering the sorus of a fern.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A protecting membrane, especially that covering the developing spores of a fern
from the GNU version of the Collaborative International Dictionary of English
- n. A collection of hairs united so as to form a sort of cup, and inclosing the stigma of a flower.
- n. 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.
- n. A peculiar covering found in certain fungi.
from The Century Dictionary and Cyclopedia
- n. In Roman antiquity, one of the two tunics commonly worn by both men and women, probably the outer tunic, though some archæologists have contended that it was the inner tunic of the women.
- n. In botany:
- n. In entomology, the coat or covering of a larval insect, as the case of a caddis-worm.
- n. In anatomy, the amnion, the innermost membrane enveloping the fetus.
- n. A layer of gray matter covering the corpus callosum in the brain: also indusium griseum.
- n. One of the embryonic envelops developed, in addition to the amnion and serosa in certain insects, such as the
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a membrane enclosing and protecting the developing spores especially that covering the sori of a fern
That the indusium is a _special_ organ, i.e. not an eruption of the cuticle, I am sure; hence it is essential to examine extensively both indusiate and other forms, the precise extension of their veins, etc. at an early period to ascertain if their most diversified situations cannot be reduced to some one type.
Sori (singular _sorus_, a heap), or fruit dots may be naked as in the polypody, but are usually covered with a thin, delicate membrane, known as the indusium (Greek, a dress, or mantle).
When followed backward the dentate gyrus separates from the fimbria at the splenium, loses its incisions and knobs, and as the fasciola cinerea passes over the splenium onto the dorsal surface of the corpus callosum and spreads out into a thin layer of gray substance known as the indusium, which can be traced forward around the genu of the corpus callosum into the gyrus subcallosus.
Sporangia borne on an elevated, globular receptacle in a membranous, cup-shaped indusium which is open at the top.
Ovarium uniovulatum; stylus inflexus; stigmatis indusium ore nudum; semen in nuce solitarium.
SERICEA, quite simple or scarcely at all lobed, and a hairy indusium. 24 The tree, still a nondescript, although the fruit had been gathered by me in 1831, and then sent to Mr. Brown, was also here; and I saw one or two trees of a species of
I will bear this in mind, as certain forms of Pteris or its affinities lead me to suspect that in these tribes the indusium may be a long way from the margin, and yet be, quoad origin, marginal; this section illustrates my meaning.
These sori are of different shape in different genera, and are usually protected by a delicate membranous covering (indusium).
The beech ferns are often classed with the polypodies, because, like them, they have no indusium; but in other ways they are more akin to the wood ferns.
The wood ferns, on the other hand, have a kidney-shaped indusium attached to the fronds by the sinus.
Wordnik is becoming a not-for-profit! Read our announcement here.