Heterothallism A condition found in algae and fungi in which sexual reproduction occurs only between genetically different self-incompatible mating types (strains) of the same species.

• 异宗配合：指在某些藻类和真菌中，进行有性生殖时，同一个种的个体（菌系）是自交不亲和的，只能在异宗的个体之间才能完成交配。