Barbacenia markgrafii Schulze-Menz

Barbacenia markgrafii Schulze-Menz

Barbacenia markgrafii Schulze-Menz in Markgraf, Notizblatt, 15:216, 1940.—L. B. Smith, Contr. U.S. Nat. Herb., 35:278, 1962.

TYPE.—Sandy open riverbank forest, mountains east of Montes Claros, Grão Mogul, Rio Itacambirussu, Minas Gerais, Brazil, 700 m alt, 13 November 1938, Markgraf, Brade & Mello Barreto 3519 (B, holotype).

DISTRIBUTION.—Known only from the type-collection.

Barbacenia albiflora L. B. Smith

Barbacenia albiflora L. B. Smith, Contr. U.S. Nat. Herb., 35:292, pl. 12: figs. 69, 70, 1962.

TYPE.—On sandstone, Serra Grão Mogul, north base of mountain, Minas Gerais, Brazil, 600–700 m alt, Maguire, Magalhães & Maguire 49213 (US, holotype; NY, isotype).

DISTRIBUTION.—Known only from the type-collection.

89. Barbacenia bibiriensis L. B. Smith & Ayensu, new species

A B. albiflora L. B. Smith, cui affinis, floribus viridibus, tepalis erectis differt.

Caudex unknown. Leaf-blades very narrowly triangular, filiform-attenuate, 28 cm long, 9 mm wide, laxly vestite with minute white pustulate-based gland-tipped hairs, ciliate with similar hairs up to 5 mm long.

Scapes (complete) to 38 cm long, laxly vestite with minute pale stipitate glands and much larger black ones. Flowers glandular like the scapes but more laxly so, green outside, white inside (!Hatschbach). Ovary ellipsoid distinct, 15 mm long. Perianth-tube above ovary slenderly subcylindric flaring slightly at apex, 32 mm long, 3 mm wide at base. Tepals narrowly ovate, obtuse, 20 mm long, the inner broader and nearly glabrous. Anthers 11 mm long, attached submedianly to the appendage and extending below it; coronoid appendage suboblong, 5 mm long including the 2 acute lobes. Style exceeded by the stamens, its apex subconical with 3 linear apically confluent stigmas.

LEAF ANATOMY (Hatschbach 30190).—Surface View: Hairs: multicellular, tufts of hairs present on both surfaces. Epidermis: cells on both surfaces square to rectangular; thin-walled. Stomata: tetracytic; 21 × 18 μm; present on both surfaces.

Transverse Section of Lamina: Dorsiventral; widely V-shaped. Multicellular tufts of hairs present on both surfaces. Surface slightly undulating. Epidermis: cells on both surfaces rounded to dome-shaped; few conical; thin-walled. Cuticle: slightly thickened and smooth over entire surface. Stomata: present on both surfaces; substomatal chamber present; stomata flush with epidermal surface. Mesophyll: 1 or 2 layers of slightly elongated palisade cells followed by 4 or 5 layers of rounded, closely packed cells; few with thickened walls. Rounded, translucent cells above midvein. Vascular bundles: 33; 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 which extends to abaxial epidermis. Short, inverted, Y-shaped adaxial girder present on each bundle and extends to adaxial epidermis. Bundle sheath surrounding each vascular bundle. Crystals: druses and styloids present in most of mesophyll. Tannins: large quantity in mesophyll especially toward midrib.

TYPE.—On rock outcrops, Biribiri, Mun. Diamantina, Minas Gerais, Brazil, 11 August 1972, Hatschbach 30190 (US, holotype; MBM, isotype).

DISTRIBUTION.—Known only from the type-collection.

Note: Name derived from “bi” (twice) and “biri.”

Barbacenia markgrafii là một loài thực vật có hoa trong họ Velloziaceae. Loài này được Schulze-Menz miêu tả khoa học đầu tiên năm 1940.