The Collaborative International Dictionary of English v.0.48:

Teleutospore \Te*leu"to*spore\, n. [Gr. ? completion + E.
   spore.] (Bot.)
   The thick-celled winter or resting spore of the rusts (order
   Uredinales), produced in late summer. See Illust. of
   Uredospore.
   [1913 Webster]