Otatea sp. nov. 1 (Fig. 15)

Material examined: — Chiapas: Arriaga, Km 13 toll road Tuxtla-Arriaga, 16°19’13.50”N, 93°51’22.8”W, 564 m, 14 February 2022, E . Ruiz-Sanchez et al. 724 (IBUG!) .

Culm anatomy description: —Culm solid. Epidermis with a layer of axially elongated thick-walled cells, 17 µm length, with frequent squared to rectangular silica bodies on top (Fig. 12B). Cortex with a layer of narrow thick-walled rounded cells followed by 2 layers of wider, thinner-walled ovoidal cells (3 layers in total, 27 µm length; Fig. 12B). Vascular bundles in 10–11 alternating cycles (Fig. 12A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 12C–E). Ovate central vascular bundles, 336 × 331 μm; two round shaped metaxylem vessels, 89 × 98 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 73 × 98 µm; sieve tubes 23 × 21 µm (Fig. 12E). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 168 µm 2.