Otatea victoriae, 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 : 92

Otatea victoriae ( Fig. 13 )

Material examined: — MEXICO. Hidalgo: Cardonal, Tolantongo-Metztitlán dirt road, 5 km east of the junction to the road that leads to Tolantongo , 20°37’38.1”N, 98°57’31.3”W, 1775 m, 2 February 2020, E . Ruiz-Sanchez & M. A . García-Martínez 647 ( IBUG!) .

Culm anatomy description: —Culm hollow with wide lacuna occupying> 50% of the total diameter. Epidermis with a layer of axially elongated lignified cells, 15 µm length, with frequent squared to rectangular silica bodies on top ( Fig. 15B ). Cortex with 3–5 layers of thick-walled rounded cells, the outer layer with slightly narrower cells(48 µm length; Fig. 15B ). Vascular bundles in 9–10 alternating cycles. Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour ( Figs. 15C–E ). Ovate central vascular bundles, 357 × 353 μm; two round shaped metaxylem vessels, 81 × 87 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 87 × 104 µm; sieve tubes 22 × 21 µm ( Fig. 15A ). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 58 µm 2. Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 9 µm 2.

Figures

FIGURE 13. Culm cross section of Otatea victoriae. 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.