Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification García-Martínez, Miguel A. Terrazas, Teresa Sánchez, Daniel Reyes, Pablo Carrillo- Ruiz-Sanchez, Eduardo Phytotaxa 2023 2023-08-22 609 2 75 102 8VZZF 47453 García-Martínez & Terrazas & Sánchez & Reyes & Ruiz-Sanchez, 2023 García-Martínez & Terrazas & Sánchez & Reyes & Ruiz-Sanchez 2023 [136,212,986,1012] Liliopsida Poaceae Otatea Plantae Poales 18 93 Tracheophyta genus sp. nov.   Material examined:—  Chiapas: Arriaga, Km13 toll road Tuxtla-Arriaga, 16°19’13.50”N, 93°51’22.8”W,  564 m,  14 February 2022,  E .   Ruiz-Sanchezet 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. 4399058301 2022-02-14 E Arriaga 564 16.320417 Tuxtla-Arriaga 1 -93.85633 Km 18 93 1 Chiapas 4399058313 [345,715,1094,1120] IBUG Ruiz-Sanchez 18 93 1 Chiapas