Otatea ramirezii, Ruiz-Sanchez, 2012

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 : 87-88

Otatea ramirezii ( Fig. 9 )

Material examined: — MEXICO. Querétaro: San Joaquín, along dirt road from Apartadero to San Juan Tetla , 20°58’56”N, 99°29’28”W, 1285 m, 19 February 2022, J. P . Ortíz-Brunel et al.1395 ( 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. 9B ). Cortex with one layer of narrow thick-walled cells followed by 2–3 layers of wider thinner-walled rounded cells (in total, 3–4 layers, 28 µm length; Fig. 9B ). Vascular bundles in 9–10 alternating cycles. Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour ( Figs. 9C–E ). Oval central vascular bundles, 275 × 297 μm; two round shaped metaxylem vessels, 77 × 81 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 73 × 97 µm; sieve tubes 20 × 20 µm ( Fig. 9E ). Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 26 µm 2.

Figures

FIGURE 9. Culm cross section of Otatea ramirezii. A. Cross section general view.B. Epidermis and cortex.C. Peripheral vascular bundle. D. Transitional vascular bundle. E. Central vascular bundle.Abbreviations: co, cortex; ep, epidermis; fs, fiber sheath; mx, metaxylem; pa, parenchyma; ph, phloem; px, protoxylem; sc, sclerenchyma; si, silica bodies.