Transverse sections of leaf and culm of Laobambos calcareus. A Transverse section of a mature foliage leaf B mesophyll showing chlorenchyma with arm cells, fusoid cells and abaxial epidermis with papillae and trichomes C culm transverse section showing a medullary region (left side) with typical vascular bundles and cavities (asterisk) and a cortical region (right side) with isolated fiber bundles (arrow) D central vascular bundle in detail E cortical region in detail. Scale bars: 100 µm (A, D, E); 10 µm (B); 200 µm (C). (Photo credit Dulce Mantuano).