Barbacenia graminifolia L. B. Sm.

Barbacenia graminifolia L. B. Smith

Barbacenia graminifolia L. B. Smith, Phytologia, 9:268, figs. 11–14, 1963.

TYPE.—Serra do Cipó, Minas Gerais, Brazil, 3 March 1958, Heringer & Castellanos 5950 (UB, holotype; US, isotype).

DISTRIBUTION.—Known only from the type-collection.

59. Barbacenia latifolia L. B. Smith & Ayensu, new species

A B. viscosissima Goethart & Henrard, cui affinis, foliis latioribus, perianthii tubo ampliore differt.

Caudex (incomplete) stout but completely covered by reflexed leaves. Leaf-blades linear-lanceolate, filiform-attenuate, somewhat contracted toward base, 18 cm long, 23 mm wide centrally, sulcate and laxly short-pubescent on both sides, ciliate with fine gland-tipped setae.

Scapes 2, 12 cm long above the leaf-sheaths, densely vestite with fine gland-tipped crisped hairs. Flowers white (!Duarte & Graziela), vestite like the scape. Ovary ellipsoid, distinct, 18 mm long. Perianth-tube above ovary infundibuliform, ca. 20 mm long, 5 mm wide at base, 15 mm wide at apex. Tepals lanceolate, over 30 mm long. Anthers 15 mm long. Coronoid appendages suboblong, acutely bidentate, 25 mm long. Style (extreme apex missing) fusiform-enlarged in the upper half; stigmas linear.

LEAF ANATOMY (Duarte & Graziela 7884).—Surface View: Hairs: long, multicellular and tufts present on both surfaces. Epidermis: cells on both surfaces 4- to 6-sided; mostly rectangular; thin-walled. Stomata: tetracytic; 21 × 18 μm; present on both surfaces.

Transverse Section of Lamina: Dorsiventral; very widely V-shaped; almost horizontal. Long multicellular hairs and tufts of hairs present on both surfaces. Both surfaces conspicuously ridged. Epidermis: cells on both surfaces rounded to dome-shaped; few conical; thin-walled; large above midvein. Cuticle: fairly thin and smooth over entire surface. Stomata: present on both surfaces; stomata usually raised above epidermal surface; substomatal chamber present. Mesophyll: 4 or 5 layers of small, rounded cells followed by 1 or 2 layers of large, translucent cells. Below is 4 or 5 layers of small, rounded cells. Cells above midvein large and translucent. Vascular bundles: 51; commissural bundles observed. One or two large vessels present in each bundle, mostly one. Two phloem units lying laterally in flanges of short Y-shaped abaxial girder. Inverted Y-shaped adaxial girder present. Girders extend to epidermis. Crystals: druses present in most of mesophyll. Tannins: present.

Note: The regions of the blade between vascular bundles are greatly reduced, thus giving the leaf the appearance of grass anatomy.

TYPE.—Rocky ground, Rio dos Cristaes, Minas Gerais, Brazil, 15 January 1963, Duarte & Graziela [Barroso] 7884 (US, holotype; RB, isotype).

DISTRIBUTION.—Known only from the type-collection.