indusium

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Related to indusia: prothallus

in·du·si·um

 (ĭn-do͞o′zē-əm, -zhē-, -dyo͞o′-)
n. pl. in·du·si·a (-zē-ə, -zhē-ə)
An enclosing membrane, as that covering the sorus of a fern.

[Latin, tunic, perhaps alteration of Greek endusis, dress, from enduein, to sink into, put on : en-, in; see en-2 + duein, to sink.]

indusium

(ɪnˈdjuːzɪəm)
n, pl -sia (-zɪə)
1. (Botany) a membranous outgrowth on the undersurface of fern leaves that covers and protects the developing sporangia
2. (Zoology) an enveloping membrane, such as the amnion
[C18: New Latin, from Latin: tunic, from induere to put on]
inˈdusial adj

in•du•si•um

(ɪnˈdu zi əm, -ʒi əm, -ˈdyu-)

n., pl. -si•a (-zi ə, -ʒi ə)
1. Bot., Mycol. any of several structures having a netlike or skirtlike shape, as the membranous overgrowth covering the sori in ferns.
2. Anat., Zool.
a. an enveloping layer or membrane.
b. a thin layer of gray matter on the corpus callosum.
[1700–10; < New Latin; Latin: kind of tunic]
in•du′si•al, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.indusium - a membrane enclosing and protecting the developing spores especially that covering the sori of a fernindusium - a membrane enclosing and protecting the developing spores especially that covering the sori of a fern
covering, natural covering, cover - a natural object that covers or envelops; "under a covering of dust"; "the fox was flushed from its cover"
sorus - cluster of sporangia usually on underside of a fern frond
References in periodicals archive ?
There appear to be two main players of relevance to Arabian workers: a diploid with entire false indusia, and an allotetraploid with fringed false indusia (Vida et al.
074 mm in diameter to eliminate the remains of sporangia and indusia.
sprucei it is formed by cells with thickened walls, in a polygonal pattern, different of the indusia described for other species of the genus (Prada and Rolleri 2006b, and unpublished data).
Sori marginal, under revolute margins of blade; indusia absent 12
Leaf stalk (petiole) essentially lacking scales (may have a few near base); indusia hood-like: Cystopteris
Sori elongate; sporangia minutely hairy; indusia absent; plant of sandstone bluffs: T.