The Collaborative International Dictionary of English v.0.48:

Monogenesis \Mon`o*gen"e*sis\, n. [Mono- + genesis.]
   1. Oneness of origin; esp. (Biol.), development of all beings
      in the universe from a single cell; -- opposed to
      polygenesis. Called also monism. --Dana. --Haeckel.
      [1913 Webster]

   2. (Biol.) That form of reproduction which requires but one
      parent, as in reproduction by fission or in the formation
      of buds, etc., which drop off and form new individuals;
      asexual reproduction. --Haeckel.
      [1913 Webster]

   3. (Biol.) The direct development of an embryo, without
      metamorphosis, into an organism similar to the parent
      organism; -- opposed to metagenesis. --E. van Beneden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

monogenesis
    n 1: asexual reproduction by the production and release of
         spores [syn: monogenesis, sporulation]