A condition in which sexual reproduction will not occur except with another compatible thallus.

Self-sterile; a dikaryon or diploid results from fusion of compatible mating types.

Organisms (fungi, algae, plants) which can only undergo sexual reproduction with another bearing a different mating/compatibility type (self- incompatible). See also homothallic.

a fungus which requires two different mating types to form sexual fruiting bodies (see homothallic).

The condition of being self-sterile, requiring a partner for sexual reproduction. ( 15)