1906 A. F. Blakeslee in 27 July 120/2 Homothallism and heterothallism therefore seem to be fixed conditions in the forms in which the sexual character has been determined.
1921 I. Mounce in 7 201 The criterion of fruit-body production is insufficient for determining the question of homothallism and heterothallism.
1966 J. R. Raper iii. 40 Three types of homothallism are found among self-fertile species.