Barbacenia celiae Maguire

Barbacenia celiae Maguire

SPECIMENS EXAMINED.—Maguire et al. 40025, 40154, 40298.

SURFACE VIEW.—Hairs: absent. Epidermis: cells square to rectangular on both surfaces, walls thin. Stomata: paracytic, 27 × 12 μm; present mainly on abaxial surface.

TRANSVERSE SECTION OF LAMINA.—Somewhat dorsiventral; widely V-shaped. Adaxial surface undulating; abaxial surface slightly ridged. Epidermis: cells on adaxial and abaxial surfaces rounded to dome shaped; thin walled. Subjacent to adaxial and abaxial epidermis a layer of parenchyma cells, some of which also form part of the bundle sheath. Cuticle: fairly thick and slightly ridged on adaxial surface; thinner and slightly ridged on abaxial surface. Stomata: present on abaxial surface; substomatal chamber present; usually occur in depression of small ridges. Mesophyll: three-layered palisade-like tissue grading into fairly compact spongy tissue; most of spongy tissue composed of large translucent cells. Vascular bundles: 39–47; no commissural bundles observed. One to two large vessels present in each vascular bundle, mostly one. Two phloem units lying laterally in flanges of Y-shaped abaxial girder. Inverted Y-shaped adaxial girder present on each vascular bundle. Bundle sheath completely surrounding each vascular bundle. Crystals: none observed. Tannins: present, numerous and occupying most of mesophyll.

Barbacenia celiae Maguire

Barbacenia celiae Maguire, Mem. New York Bot. Gard., 18(2):33, fig. 6 A–N, 1969.—Ayensu, Smithsonian Contr. Bot., 15:57, pl. 48b, 1974.

TYPE.—Common on conglomerate outcrop, northwest escarpment of Serra Tepequem, Roraima, Brazil, 860–960 m alt, 23 November 1954, Maguire & Maguire 40025 (NY, holotype; US, isotype).

DISTRIBUTION.—Brazil: Roraima: Serra Tepequem, Serra Sabang.

Subkey II