Perithecial production for matings in Experiment L (a) and Experiment H (b) at assay point 7. Matings in which the female lineage was fertilized by males evolved in the parallel environment (PE matings, n = 12) or the divergent environment (DE matings, n = 18), are in grey or white, respectively. For clarity, the paternal lineage-classes are also shown. Full assays were performed once and four times for Experiment L and H, respectively. Asterisks indicate significance differences between mating classes, as determined by two-tailed t-tests. Errors bars are standard error.