Figure 2. Key morphological characters of N. crassa, N. tetrasperma and N. discreta 144 h after crossing.

Scanning electron micrographs, in which arrowheads indicate the perithecial beaks, of A) N. crassa (bar: 134 µm), B) N. tetrasperma (bar: 98 µm) and C) N. discreta (bar: 98 µm), and light micrographs of squash mounts of (D) N. crassa (a: ascus), (E) N. tetrasperma, and (F) N. discreta (with conidia). At 144 h, some spores are not fully mature.