Fig. 10.5-1. Transverse section of fig leaf (Ficus). The feature to notice here is the large cell – a lithocyst (“rock cell”) which contains a cystolith (a “cell rock”). Although the lithocyst appears to be a large mesophyll cell, it actually is a giant epidermis cell that protrudes into the mesophyll. The cell is so large that the microtome knife can cut it into many sections, and usually only the central one or two sections show the upper tip of the cell, which is actually located among the ordinary epidermis cells.