indusium

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.

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[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.

Thesaurus

Noun

1.

indusium - 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