Zea mays stem (left) and root (right) cross sections - prepared slide from Carolina Biologicals. You can clearly see the difference in the arrangement of the vascular bundles - the stem has an atactostele (scattered bundles) while the root has a eustele similar to what you would find in the stems of dicot plants (but here surrounded by the root tissues pericylce and endodermis).
Playing around with the camera... I could not get a picture of the entire sections using the microscope because it magnifies them too much, so this was taken with the Canon PowerShot SX10 and the Raynox macro lens added. I placed the slide on a light table and took several shots. They all had some out-of-focus areas, so I selected the best two and stacked them using CombineZM for better focus. The result is quite impressive for a point-and-shoot without using a microscope, I must say! I also tried using the SuperMacro function of the camera and placing it right on top of the slide but the Raynox pictures turned out much larger and sharper - I downsized this to fit my computer screen.