Otatea glauca, Clark & Cortes, 2004

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 : 85-86

Otatea glauca ( Fig. 8 )

Material examined: — MEXICO. Chiapas: Motozintla, Km 37 of the Huixtla-Motozintla highway, 15°19’46.58”N, 92°19’25.72”W, 1141 m, 14 February 2022, E . Ruiz-Sanchez et al. 726 ( IBUG!) .

Culm anatomy description: —Culm hollow, the lacuna occupying> 50% of the total diameter. Epidermis with a layer of axially elongated lignified cells, 12 µm length, with frequent rectangular silica bodies on top ( Fig. 8C ). Cortex with 2 layers of narrow thick-walled cells followed by 2–3 layers of wider, thinner-walled cells (in total, 4–5 layers, 52 µm length; Fig. 8C ). Vascular bundles in 8–9 alternating cycles ( Fig. 8A ). Peripheral, transitional, and central vascular bundles surrounded by a lignified sclerenchyma sheath defining their contour ( Figs. 8D–F ). Cell wall of fiber sheath weakly lignified. Oval central vascular bundles, 462 × 362 μm; two round shaped metaxylem vessels, 89 × 92 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 82 × 104 µm; sieve tubes 18 × 21 µm ( Fig. 8F ). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 187 µm 2 ( Fig. 8B ). Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 6 µm 2.

Figures

FIGURE 8. Culm cross section of Otatea glauca. A. Cross section general view. B. Fiber sheath with an amorphous silica body occupying cellular space. 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.