Fig. 2.

The filamentous morphologies of strains A1153 and 972 are similar. (A) Invasive structures formed by strain A1153 after several weeks. The structures are large and complex and resemble those formed by strain 972. Bar, 100 μm. (B) Filaments at single-cell resolution. After 3 days, invasive structures formed by both strains (strains A1153 and 972) were observed in agar slices. The average filament size at division was estimated by measuring the lengths of septated filament tips (Table 2). Bar, 10 μm.