Sago cycad leaf. Coloured scanning electron micrograph (SEM) of a section through a sago cycad (Cycas revoluta) leaf. At lower centre and left are vascular bundles (beige clusters), which are part of the network of veins that transports water and nutrients to and from the leaf. The sago cycad, also called the sago palm, is used as a major staple food in tropical countries due to its starchy seeds and stem. Magnification: x250 when printed 10 centimetres wide.