sorus

sorus

[sawr-uhs, sohr-]
noun, plural sori [sawr-ahy, sohr-ahy] .
1.
Botany. one of the clusters of sporangia on the back of the fronds of ferns. See diag. under fern.
2.
Mycology. a soruslike spore mass of certain fungi and lichens.

Origin:
1825–35; < Neo-Latin < Greek sōrós heap

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World English Dictionary
sorus (ˈsɔːrəs)
 
n , pl -ri
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
 
[C19: via New Latin from Greek sōros a heap]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sorus   (sôr'əs)  Pronunciation Key 
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 Britannica
Encyclopedia

sorus

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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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