Naples garlic The structure of garlic could be mistaken for exquisite coloured glass. When a tiny stem section is stained with toluidine blue, a dye that builds up in the acidic parts of tissue, nucleic acids show up in blue. The dark spot is a bundle of vascular tissue that carries nutrients and fluids up the stem. The full image is a composite of 55 shots.
Find out more about plants under the microscope in this video from Kew. Plants under the microscope, wood anatomy at Kew Gardens - www.kew.org/video/beneath-the-skin-of-plants/index.htm (Photo Peter Gasson RBG Kew)