Isospory


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Isospory

 

the formation in plants of spores of one size.

Isospory is characteristic of ferns (excluding the aquatic varieties—the salvinias, pepperworts, and azollas), horsetails, and club mosses (excluding the selaginellas). On some horsetails, smaller spores (male prothallia with antheridia) or larger spores (female, with archegonia) develop out of externally identical spores, depending on the conditions of nourishment and light. Thus, by regulating the conditions for spore germination, it is possible to alter the sex of the prothallus (physiological heterospory).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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