heterothallic

het·ero·thal·lic

adj \-ˈthal-ik\

Definition of HETEROTHALLIC

: having two or more morphologically similar haploid phases or types of which individuals from the same type are mutually sterile but individuals from different types are cross-fertile

—het·ero·thal·lism \-ˈthal-ˌiz-əm\ noun