Barbacenia stenophylla Goethart & Henrard

Barbacenia stenophylla Goethart & Henrard

SPECIMENS EXAMINED.—Irwin et al. 9901.

SURFACE VIEW.—Hairs: few present in tufts. Epidermis: cells square to rectangular, few rounded; thin walled. Stomata: paracytic, 30 × 12 μm; present on adaxial and abaxial surface.

TRANSVERSE SECTION OF LAMINA.—Isolateral; V-shaped with small median adaxial groove. Adaxial and abaxial surfaces slightly undulating. Epidermis: cells on adaxial and abaxial surfaces rounded to dome shaped; walls on both surfaces thin. Layer of parenchyma cells subjacent to adaxial epidermis. Cuticle: very thin and ridged on both surfaces. Stomata: present on abaxial and adaxial surfaces; substomatal chamber present; flush with epidermal surface. Mesophyll: undifferentiated. Some translucent cells scattered in spongy mesophyll. Two to three layers translucent palisade cells arranged radially above midvein. Vascular bundles: 23; no commissural bundles observed. One large vessel present in each vascular bundle. Two phloem units lying laterally in flanges of Y-shaped abaxial girder. Inverted Y-shaped adaxial sclerenchyma present on each vascular bundle. Bundle sheath completely surrounding each vascular bundle. Crystals: none observed. Tannins: present mostly in mesophyll.

Subkey II

Barbacenia stenophylla Goethart & Henrard

Barbacenia stenophylla Goethart & Henrard, Blumea, 2:361, 1937.—L. B. Smith, Contr. U.S. Nat. Herb., 35:276, 1962.—Ayensu, Smithsonian Contr. Bot., 15:57, 1i,j, 19d–f, 1974.

TYPE.—Among rocks, Morro do Salto, Goiás, Brazil, 15 January 1895, Glaziou 22220a (L, holotype, B, photo 154).

DISTRIBUTION.—Brazil: Minas Gerais: in soil-filled crevices of outcrop, 6 km south of Cristalina, Serra dos Cristais, 17° S, 48° W, Goiás, Brazil, 1175 m alt, 4 November 1965, Irwin et al. 9901 (NY, UB, US).