sorus
Americannoun
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Botany. one of the clusters of sporangia on the back of the fronds of ferns.
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Mycology. a soruslike spore mass of certain fungi and lichens.
noun
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a cluster of sporangia on the undersurface of certain fern leaves
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any of various similar spore-producing structures in some lichens and fungi
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A cluster of sporangia borne on the underside of a fern frond. A sorus is sometimes covered by an indusium.
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Also called fruitdot
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A reproductive structure consisting of masses of spores, characteristic of certain fungi such as rusts and smuts.
Other Word Forms
Noun Inflected Forms
Etymology
Origin of sorus
1825–35; < New Latin < Greek sōrós heap
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
But Brock also thought she saw something else in the sorus.
From Slate ● Jan. 19, 2011
Indusium convex, fixed by a broad base partly under the sorus, commonly reflexed as the sporangia ripen.
From The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee by Gray, Asa
Indusium cup-shaped, fixed beneath the sorus, supported by the tooth of a leaf; sporangia borne in an elevated, globular receptacle open at the top.
From The Fern Lover's Companion A Guide for the Northeastern States and Canada by Tilton, George Henry
This occasionally happens from the elongation of the normally placed sorus, which thus extends to the margin, and returns on the upper side, when the sori chance to be placed opposite to the marginal crenatures.
From Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants by Masters, Maxwell T.
Indusium hood-shaped, fixed centrally behind the sorus and arching over it, soon withering, often illusive.
From The Fern Lover's Companion A Guide for the Northeastern States and Canada by Tilton, George Henry
They are distinguished by large leaves called fronds and small sporangia-containing structures called sori, which are found on the underside of the fronds.
From Textbooks ● Jan. 1, 2015
Inside the sori, spores are produced by meiosis and released into the air.
From Textbooks ● Jan. 1, 2015
The photo shows small bumps called sori on the underside of a fern frond.
From Textbooks ● Jan. 1, 2015
This occasionally happens from the elongation of the normally placed sorus, which thus extends to the margin, and returns on the upper side, when the sori chance to be placed opposite to the marginal crenatures.
From Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants by Masters, Maxwell T.
Lobes obtuse, but appear acute when their margins are reflexed over the sori.
From The Fern Lover's Companion A Guide for the Northeastern States and Canada by Tilton, George Henry
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
