Cell morphology of U. maydis wild-type and mutant strains. Strains were grown in MM at pH 3 (A, B, and C) or pH 7 (D, E, and F) and stained with Calcofluor white. A and D, FB2 (wild type); B and E, BMA2 (Δrim101); C and F, PGM1 (Δrim101::hyg/pUpacC23). Bar, 10 μm.