Fruiting structures of different mating-type isolates. (a, b) Sterile fruiting bodies formed on caterpillar pupae after inoculation of MAT1-1 (a) and MAT1-2 (b) isolates acquired by single conidial spore isolation from a MAT1-1/MAT1-2 hybrid strain, Cm06. (c-e) Fertile fruiting structures formed on caterpillar pupae after inoculation of the mixed conidia of MAT1-1 (Cm01) and MAT1-2 (Cm06) at ratios of 1:9 (c), 1:1 (d) and 9:1 (e), respectively. The right panels represent close-up views of corresponding sterile (without protruded perithecia) or fertile (with protruded perithecia) fruiting bodies. After inoculation, the pupae were incubated at 22°C with a 12:12 hour light:dark cycle for 60 days.