The Collaborative International Dictionary of English v.0.48:

Spermospore \Sper"mo*spore\, n. [Spermo- + spore.] (Physiol.)
   The male germinal or seminal cell, from the breaking up of
   which the spermoblasts are formed and ultimately the
   spermatozoids; a spermatospore. --Balfour.
   [1913 Webster]