Barbacenia gentianoides Goethart & Henrard

Barbacenia gentianoides Goethart & Henrard

Barbacenia gentianoides Goethart & Henrard, Blumea, 2:347, fig. M, 1937.—L. B. Smith, Contr. U.S. Nat. Herb., 35:280, 1962.—Ayensu, Smithsonian Contr. Bot., 15:64, fig. 20a–c, 41c–e, 1974.

Barbacenia gentianoides Goethart & Henrard

SPECIMENS EXAMINED.—Segadas-Vianna and Lo-redo 1066.

SURFACE VIEW.—Hairs: multicellular; some papillae present. Epidermis: cells rounded, square to rectangular. Stomata: paracytic, 27 × 12 μm; present on abaxial surface.

TRANSVERSE SECTION OF LAMLNA.—Dorsiventral; widely V-shaped with slight median adaxial groove. Both adaxial and abaxial surfaces undulating. Epidermis: cells on adaxial and abaxial surfaces dome shaped; thin walled. Distinct layer of parenchyma cells subjacent to adaxial epidermis. Sclerenchyma strands occur below parenchyma layer, usually extending on either side of adaxial side of vascular bundle. Cuticle; very thin on adaxial and abaxial surfaces. Stomata: present on abaxial surface. Substomatal chamber present. Mesophyll: three to four layers of palisade cells present. Abruptly changing into loosely arranged spongy tissue. Some translucent cells present in spongy layer. Vascular bundles: 30; commissural bundles observed. One to two large vessels, mostly one. Two phloem units lying laterally in flanges of V- or Y-shaped abaxial girder. Inverted Y-shaped adaxial girder present on each vascular bundle. Bundle sheath completely surrounding vascular bundles. Crystals: none observed. Tannins: few present.