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sorus

[sawr-uh s, sohr-] /ˈsɔr əs, ˈsoʊr-/
noun, plural sori
[sawr-ahy, sohr-ahy] /ˈsɔr aɪ, ˈsoʊr aɪ/ (Show IPA)
1.
Botany. one of the clusters of sporangia on the back of the fronds of ferns.
2.
Mycology. a soruslike spore mass of certain fungi and lichens.
Origin
1825-1835
1825-35; < New Latin < Greek sōrós heap
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sorus

sorus

/ˈsɔːrəs/
noun (pl) -ri (-raɪ)
1.
a cluster of sporangia on the undersurface of certain fern leaves
2.
any of various similar spore-producing structures in some lichens and fungi
Word Origin
C19: via New Latin from Greek sōros a heap
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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sorus in Science
sorus
  (sôr'əs)   
Plural sori (sôr'ī)
  1. A cluster of sporangia borne on the underside of a fern frond. A sorus is sometimes covered by an indusium. Also called fruitdot.

  2. A reproductive structure consisting of masses of spores, characteristic of certain fungi such as rusts and smuts.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for sorus

sori

in botany, brownish or yellowish cluster of spore-producing structures (sporangia) usually located on the lower surface of fern leaves. A sorus may be protected during development by a scale or flap of tissue called an indusium. In rust and smut fungi, a sorus is a spore mass produced on the leaf of an infected plant. Reproductive structures called sori also occur in various species of marine algae. See also spore.

Learn more about sori with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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