Otatea rzedowskiorum, Ruiz-Sanchez, 2015

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 rzedowskiorum ( Fig. 11 )

Material examined: — MEXICO. Chiapas: Ocozocoautla, El Aguacero waterfall, 16°45’35.34”N, 93°31’29.32”W, 535 m, 15 February 2022, E . Ruiz-Sanchez et al. 731 ( IBUG!).

Culm anatomy description: —Culm solid. Epidermis with a layer of axially elongated lignified cells, 9 µm length, with occasional rectangular silica bodies on top ( Fig. 11C ). Cortex with a layer of thick-walled axially elongated cells followed by 2–3 layers of wider thinner-walled rounded cells (in total, 3–4 layers, 23 µm length; Fig. 11C ). Vascular bundles in 5–6 alternating cycles ( Fig. 11A ). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour ( Figs. 11D–F ). Central vascular bundles broadly depressed, 180 × 260 µm; two round shaped metaxylem vessels, 63 × 64 µm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 49 × 60 µm, sieve tubes 15 × 14 µm ( Fig. 11F ). Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 8 µm 2 ( Fig. 11B ). Abundant starch grains in the ground cells ( Fig. 11B ).

Figures

FIGURE 11. Culm cross section of Otatea rzedowskiorum. 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.