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sorus

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Sores
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so⋅rus

  [sawr-uhs, sohr-]
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–noun, plural so⋅ri  [sawr-ahy, sohr-ahy] .
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:
1825–35; < NL < Gk sōrós heap
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Sores
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so·rus   (sôr'əs, sōr'-)   
n.   pl. so·ri (sôr'ī, sōr'ī)

  1. A cluster of sporangia borne on the underside of a fern frond.

  2. A reproductive structure in certain fungi and lichens.


[New Latin sōrus, from Greek sōros, heap; see teuə- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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

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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