Otatea, García-Martínez & Terrazas & Sánchez & Reyes & Ruiz-Sanchez, 2023

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 : 93

Otatea sp. nov. 1 ( Fig. 15 )

Material examined: — Chiapas: Arriaga, Km 13 toll road Tuxtla-Arriaga , 16°19’13.50”N, 93°51’22.8”W, 564 m, 14 February 2022, E . Ruiz-Sanchez et 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.

Figures

FIGURE 12. Culm cross section of Otatea transvolcanica. 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.

FIGURE 15. Culm cross section of Otatea sp. nov. 1. 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.