Source : Webster's Revised Unabridged Dictionary (1913)

Ascospore \As"co*spore\, n. [Ascus + spore.] (Bot.)
   One of the spores contained in the asci of lichens and fungi.
   [See Illust. of {Ascus}.]

Source : WordNet®

ascospore
     n : sexually produced fungal spore formed within an ascus