The Collaborative International Dictionary of English v.0.48:

Ascospore \As"co*spore\, n. [Ascus + spore.] (Bot.)
   One of the spores contained in the asci of lichens and fungi.
   [See Illust. of Ascus.]
   [1913 Webster] ascosporic

WordNet (r) 3.0 (2006):

ascospore
    n 1: sexually produced fungal spore formed within an ascus