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sorus

[sawr-uh s, sohr-]
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noun, plural so·ri [sawr-ahy, sohr-ahy] /ˈsɔr aɪ, ˈsoʊr aɪ/.
  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.
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Origin of sorus

1825–35; < New Latin < Greek sōrós heap
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for sorus

Historical Examples

  • The indusium arises from a vein to which the sorus is attached.

    How to Know the Ferns

    S. Leonard Bastin

  • The sorus is circular and is covered with an indusium which is notched or kidney-shaped.

    How to Know the Ferns

    S. Leonard Bastin

  • The proper (often shield-shaped) covering of the sorus or fruit-dot in Ferns.

  • Indusium hood-shaped, fixed centrally behind the sorus and arching over it, soon withering, often illusive.

    The Fern Lover's Companion

    George Henry Tilton

  • Indusium star-shaped, of a few irregular segments fixed beneath the sorus, often obscure.

    The Fern Lover's Companion

    George Henry Tilton


British Dictionary definitions for sorus

sorus

noun plural -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
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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

sorus in Science

sorus

[sôrəs]
Plural sori (sôrī)
  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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.