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sori

[sawr-ahy, sohr-ahy] /ˈsɔr aɪ, ˈsoʊr aɪ/
noun
1.
plural of sorus.

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 of sorus
1825-1835
1825-35; < New Latin < Greek sōrós heap
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for sori
Historical Examples
  • The sori are placed on veins which branch out from the mid-veins of the pinnules.

    How to Know the Ferns S. Leonard Bastin
  • The sori are borne in lines on either side of the mid-vein of the lobe.

    How to Know the Ferns S. Leonard Bastin
  • The sori are quickly confluent, and all trace of the indusium is soon lost.

    Beautiful Ferns Daniel Cady Eaton
  • The sori are very abundant, but as these are small they should be carefully examined.

    How to Know the Ferns S. Leonard Bastin
  • The sori are placed on either side of the vein in the middle of the pinnules.

    How to Know the Ferns S. Leonard Bastin
  • The sori are narrow, and when young are covered with an indusium.

    How to Know the Ferns S. Leonard Bastin
  • The sori are close to the margin of the lobes, and vary from one to twelve to a lobe.

    Beautiful Ferns Daniel Cady Eaton
  • Nearly the whole of the underside of the frond bears the sori.

    How to Know the Ferns S. Leonard Bastin
  • Polýstichum is the Greek for many rows, the sori of some species being in many ranks.

    The Fern Lover's Companion George Henry Tilton
  • The sori are quite naked, no indusia being present at any time.

    How to Know the Ferns S. Leonard Bastin
British Dictionary definitions for sori

sori

/ˈsɔːraɪ/
noun
1.
the plural of 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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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sori 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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