Leaf blade transverse sections of Poa sanchez-vegae (A–C) and Poa hitchcockiana (D). Poa sanchez-vegae: A Entire leaf blade B Midvein showing a single primary vascular bundle with bulliform cells (b indicated by arrows) C Lateral primary vascular bundle with a few associated abaxial sclerenchyma fibers (sf) and spongy chlorenchyma (chl). Poa hitchcockiana: D Midvein showing a single primary vascular bundle with abaxial sclerenchyma fibers (sf) and collapsed chlorenchyma.