Otatea acuminata VER (Fig. 5)

Material examined: — MEXICO. Veracruz: Emiliano Zapata, 2km south of Cerro Gordo, 19°25’17.3”N, 96°41’17.1”W, 525 m, 31 January 2020, E . Ruiz-Sanchez & M. A . García-Martínez 643 (IBUG!) .

Culm anatomy description: —Culm solid. Epidermis with a layer of axially elongated lignified cells, 11 µm length, with frequent squared to rectangular silica bodies on top (Fig. 5C). Cortex with one layer of thick-walled rounded cells followed by 2–3 layers of thinner-walled oval to rounded cells (3–4 layers in total, 34 µm length; Fig. 5C). Vascular bundles in 10–11 alternating cycles (Fig. 5A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 5D–F). Elliptical central vascular bundles, 484 × 466 μm; two round shaped metaxylem vessels, 104 × 106 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 66 × 81 µm; sieve tubes 18 µm × 25 µm (Fig. 5F). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 122 µm 2. Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 17 µm 2 (Fig. 5B).