FIG 1 .

Fertility of A. fumigatus. Representative examples of the three levels of fertility (HF, MF, and LF) observed in 50 isolates at 4-week mating are shown in panels A to C. (A) Mating between two isolates of the HF type, AFB62 (MAT-1) and AFIR928 (MAT-2) (supermater pair). The junction zone (white arrows) is heavily populated with fruiting bodies (D, yellow arrows). (B) Mating between HF isolate AFB62 and an isolate of the MF type, AFB60. A significantly lower number of cleistothecia were produced (E, yellow arrows). (C) Mating between HF isolate AFIR928 and AFN15, an isolate of the LF type. Few cleistothecia were found scattered along the junction zone (F, yellow arrows). Panels D, E, and F show higher magnifications of the white insets in panels A, B, and C, respectively.