Now draw the general shapes of different bacteria on the surface, and then add a little pili. Draw the umbrella hair lighter.

Fimbriae: On the cell surface of many Gram-negative bacteria and a few Gram-positive bacteria, there are some filaments thinner, shorter and harder than flagella, which are called fimbriae or umbrella hairs and cilia. No fimbriae can be seen under ordinary optical microscope, so it must be observed by electron microscope.