indusium

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Related to indusium: pollen grain, indehiscent, strobilus, sporophyll, indusium griseum

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.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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.

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Noun

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

References in periodicals archive ?

The submerged leaf bears the spore-producing organs, which consist of a sori surrounded by an indusium globose ("sporocarp"; De La Sota, 1962).

Biomass allocation and nutrients balance related to the concentration of nitrogen and phosphorus in Salvinia auriculata (Salviniaceae)/Alocacao de biomassa e o Balanco de nutrientes relacionados a concentracao de nitrogenio e fosforo em Salvinia auriculata (Salviniaceae)

Which of the following is an element: indium, indusium or indumentum?

QUIZ OF THE DAY

The midline glial structures mainly consist of four structures: the glial wedge (GW), the indusium griseum (IG), the midline zipper (MZ), and the glial sling (GS) [8, 16] (Figure 1).

Axon guidance mechanisms for establishment of callosal connections

Sporangia ovoid, 60-100 [micro]m in diam., with indusium, located along the concentric bands near the apical margin only on one side of the blades.

New records of green (Chlorophyta) and brown algae (Phaeophyceae) for Cabezo Reef, National Park Sistema Arrecifal Veracruzano, Gulf of Mexico

The dorsal extension of the hippocampus (the indusium griseum--also called the supracallosal gyrus) comprises two thin grey-matter strips that overlay the corpus callosum; it is a vestigial structure of unknown function in the postnatal brain.

The tokoloshe homunculus

Each sorus may be covered with a membrane-like protective layer called the indusium. When the spores mature, the indusium shrivels or breaks, and the spores are released.