Otatea reynosoana

García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo- & Ruiz-Sanchez, Eduardo, 2023, Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification, Phytotaxa 609 (2), pp. 75-102 : 88

Otatea reynosoana ( Fig. 10)

Material examined: — MEXICO. Michoacán: Morelia, Filtros Viejos, on the banks of the Chiquito river , 19°40’35.2”N, 101°9’13.7”W, 1947 m, 3 February 2020, E . Ruiz-Sanchez & M. A . García-Martínez 649 ( IBUG!) .

Culm anatomy description: —Culm hollow, the lacuna occupying <50% of the total diameter. Epidermis with a layer of square to rectangular thick-walled cells, 11 µm length, with occasional rectangular silica bodies on top ( Fig. 10C). Cortex with 3–4 layers of thick-walled rounded cells, the outer narrower, 27 µm length, with dark staining deposit ( Fig. 10C). Vascular bundles in 5–6 alternating cycles ( Fig. 10C). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour ( Figs. 10D–F). Depressed central vascular bundles, 249 × 351 μm; two round shaped metaxylem vessels, 80 × 88 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 56 × 91 µm; sieve tubes 19 × 21 µm ( Fig. 10F). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 78 µm 2. Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 11 µm 2 ( Fig. 10B).