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a cell formed by fusion of two similar gametes, as in certain algae and fungi.
Historical Examples

The zygospore thus formed germinates after a long period and forms a new filament of cells.
Scientific American Supplement, Vol. XXI., No. 531, March 6, 1886 Various

The product of the union of two zygoblasts is termed a zygospore.
Scientific American Supplement, Vol. XXI., No. 531, March 6, 1886 Various

During all these changes, while the zygospore enlarges, the wall of the arcuate cells becomes coloured brown.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

a thick-walled sexual spore formed from the zygote of some fungi and algae
(zī’gə-spôr’, zĭg’ə-)
A large, multinucleate spore formed by union of isogametes (gametes that are not distinguished by size and structure), as in certain algae or fungi. A zygospore develops thick, resistant walls and enters a period of dormancy before germinating.


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