These cross-sections show the micro-scale pipes that carry the water up to the higher parts of the plant. Just like the cross section of a tree, it is possible to see differently specialized cells through the radii of the leaves. Every single closed shape is a living cell with cellulose walls. After the plant dies the cellulose walls stay. However, since these leaves have very thin walls these cellulose walls tend to degrade in a short period of time. These specimens were prepared with ink sucked into the plant to make the cells more visible.