Cross-section round. Outline wavy. Culm center hollow. Recognizable epidermis cells. Peripheral sclerenchymatic stabilisation structure (girders) rectangular. Large vascular bundles in one row. Vascular bundles integrated in peripheral stabilisation struc
Outline smooth. Upper epidermis cells in several rows. Vascular bundles centered between the upper and lower side of the leaf. Girders extending from the vascular bundle to the lower side of the leaf.