Otatea acuminata JAL (Fig. 3)

Material examined: — MEXICO. Jalisco: San Sebastián del Oeste, Mascota-Puerto Vallarta road, near arch bridge, 20°48’11”N, 104°56’13”W, 725 m, 28 July 2020, E . Ruiz-Sanchez 672 (IBUG!) .

Culm anatomy description: —Culm solid (Figs. 3A, B). Epidermis with a layer of rounded lignified cells, 10 µm length, with frequent squared to rectangular silica bodies on top (Fig. 3C). Cortex with 3–4 layers of thick-walled rounded cells, followed by 1–2 layers of thinner-walled rounded cells (5–6 layers in total, 41 µm length; Fig. 3C). Vascular bundles in 9–10 alternating cycles (Fig. 3A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 3D–F). Ovate central vascular bundles, 287 × 288 μm; two round shaped metaxylem vessels, 69 × 73 µm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 63 × 75 µm; sieve tubes 19 × 18 µm (Fig. 3F). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 86 µm 2.