Barbacenia ignea Mart. ex Schult. & Schult. fil.

Barbacenia ignea Martius ex Schultes f

SPECIMENS EXAMINED.—L. O. Williams and Assis 6817.

SURFACE VIEW.—Hairs: absent. Epidermis: cells square to rectangular; thin walled. Stomata: paracytic, 24 × 12 μm; present on abaxial and adaxial surfaces.

TRANSVERSE SECTION OF LAMINA.—Isolateral; V-shaped; turned slightly inversely at margins of lamina. Adaxial and abaxial surfaces only very slightly undulating. Epidermis: cells dome shaped to rectangular on adaxial and abaxial surfaces. Layer of parenchyma cells subjacent to adaxial and abaxial epidermis. Cuticle: thin and slightly ridged on both surfaces. Stomata: present on abaxial and adaxial surfaces. Substomatal chamber present; stomata almost flush with epidermal surface. Mesophyll: two to three layers of small cells grading into large spongy tissue. Large number of translucent cells present in center of spongy mesophyll. Vascular bundles: 49; few commissural bundles observed. One to two large vessels observed, mostly one. Two phloem units lying laterally in flanges of Y-shaped abaxial girder. Inverted Y-shaped adaxial girder present on all vascular bundles. Bundle sheath completely surrounding each vascular bundle. Crystals: none observed. Tannins: numerous, present in mesophyll especially toward adaxial and abaxial surface.

Barbacenia ignea Martius ex Schultes f

Barbacenia ignea Martius ex Schultes f. in Roemer and Schultes, Syst., 7:285, 1826.—Seubert in Martius, Fl. Bras., 3(1):71, pl. 8: fig. 6, 1847.—L. B. Smith, Contr. U.S. Nat. Herb., 35:278, 1962.—Ayensu, Smithsonian Contr. Bot., 15:58, fig. 21d–f, pls. 39e,f, 40a, 1974.

TYPE.—On mountains, Minas Gerais, Brazil, Martius s n (M, holotype; F, photo 18994).

DISTRIBUTION.—Known only from the type-collection.