Estimation of the number of perithecia produced during crosses between the strains after several asexual generations (AGs). Perithecia were counted on 9 mm2 squares at three different positions along the confrontation line. Closed red symbols: number of perithecia produced by the evolved strain (female fertility). Open blue symbols: number of perithecia produced by the reference strain, i.e. induced by the evolved strains (male fertility). Triangles: first reference strain; Circles: second reference strain. The name of the reference strain used for the crosses is given in brackets. The curves are the Poisson regressions fitted to the data: y = ea+bt.