a spore developed in an ascus. [After German Ascosporen, plural (1857 or earlier).]
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the world > plants > part of plant > reproductive part(s) > spore or sporule > [noun] > type of > thecospore or ascus
ascus1830
thecospore1858
macrocyst1874
ascogonium1875
ascospore1875
cleistocarp1887
1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 240 The Ascospores [Ger. Ascosporen]..arise by free cell-formation in the protoplasm of the..Ascus.