Algae alternation of generations.
<P>
   The  multicellular,  diploid  sporophyte  produces unicellular haploid
   spores by meiosis.
<P>
   The   spores  develop  into  multicellular,  haploid  male  or  female
   gametophytes by mitosis.
<P>
   The  gametophytes  produce  gametes;  fertilization  yields  a diploid
   zygote.
<P>
   A zygote develops into a multicellular, diploid sporophyte by mitosis.