Otatea acuminata VER

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 : 82

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 ).

Figures

FIGURE 5. Culm cross section of Otatea acuminata VER. A. Cross section general view. B. Conical silica bodies occupying intercellular spaces.C. Epidermis and cortex. D. Peripheral vascular bundle.E. Transitional vascular bundle. F. Central vascular bundle.Abbreviations: co, cortex; ep, epidermis; fs, fiber sheath; mx, metaxylem; pa, parenchyma; ph, phloem; px, protoxylem; sc, sclerenchyma; si, silica bodies.