indusium [in- doo-zee- uh m, -zhee- uh m, - dyoo-] EXAMPLES | WORD ORIGIN noun, plural in·du·si·a . [in- doo-zee- uh, -zhee- uh, - dyoo-] /ɪnˈdu zi ə, -ʒi ə, -ˈdyu-/ . Botany, Mycology any of several structures having a netlike or skirtlike shape, as the membranous overgrowth covering the sori in ferns. . Anatomy, Zoology an enveloping layer or membrane. a thin layer of gray matter on the corpus callosum. Origin of indusium 1700–10;
New Latin; Latin:
kind of tunic, perhaps <
) dressing, dress (
) to put on +
Related forms in·du·si·al, adjective
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for indusium Historical Examples of indusium
indusium arises from a vein to which the sorus is attached.
Thus it is proper to describe the shape of the
indusium as peltate.
The sori are narrow, and when young are covered with an
The sorus is circular and is covered with an
indusium which is notched or kidney-shaped.
indusium is orbicular-reniform, and almost always smooth. British Dictionary definitions for indusium noun plural -sia ( -zɪə) a membranous outgrowth on the undersurface of fern leaves that covers and protects the developing sporangia an enveloping membrane, such as the amnion Derived Forms indusial, adjective Word Origin for indusium
C18: New Latin, from Latin: tunic, from
induere to put on
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Plural indusia A thin membrane covering the sorus of a fern. The indusium often shrivels away when spores are ready to be dispersed. Also called fruitcover A cuplike structure fringed with hairs and located at the top of the style in flowers of the family Goodeniaceae (which includes the garden flowers lobelia and scaevola). Pollen is deposited into the indusium by the anthers of the same flower and, as the style grows, carried up for dispersal by pollinating insects.
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