Barbacenia viscosissima Goethart & Henrard

Barbacenia viscosissima Goethart & Henrard

Barbacenia viscosissima Goethart & Henrard, Blumea, 2:363, 1937.—L. B. Smith, Contr. U.S. Nat. Herb., 35:280, 1962.—Ayensu, Smithsonian Contr. Bot., 15:69, pls. 40h, 41a,b, 1974.

Aylthonia viscosissima (Goethart & Henrard) Menezes, Ciência e Cultura, 23(3):422, 1971.

TYPE.—São João (del Rei), Minas Gerais, Brazil, June 1824, Riedel 205 (L, holotype; LE, isotype).

DISTRIBUTION.—Brazil: Minas Gerais: Ouro Preto, São João del Rei.

62. Barbacenia umbrosa L. B. Smith & Ayensu, new species

A B. viscosissima Goethart & Henrard, cui affinis, foliorum laminis angustioribus scapos subaequantibus supra basin glabris differt.

Caudex (incomplete) over 2 cm long, 23 mm wide including leaf-sheaths but wholly covered by re-flexed blades. Leaves to 24 in terminal fascicle, sulcate on both sides; sheaths brown and lustrous beneath, glabrous where not exposed; blades linear, filiform-attenuate, to 17 cm long, 6 mm wide, white-pubescent and laxly setose-ciliate near base, elsewhere glabrous, sulcate on both sides.

Scapes 2 or 3, to 16 cm long, laxly and finely stipitate-glandular. Flowers dull red (!Irwin et al.), laxly glandular like the scape. Ovary ellipsoid, distinct, 10 mm long. Perianth-tube above ovary slenderly infundibuliform, 35–40 mm long, 4 mm wide at base, 10 mm at apex. Tepals nearly uniform, linear-lanceolate, 17 mm long. Anthers ca. 11 mm long. Coronoid appendages subtriangular, sharply bidentate, ca. 7 mm long. Style subglobose at apex; stigmas elliptic, apically confluent.

LEAF ANATOMY (Irwin et al. 23491).—Surface View: Hairs: multicellular, present on abaxial surface. Epidermis: cells on both surfaces square to rectangular; thin-walled. Stomata: tetracytic; 18 × 15 μm; present in rows on both surfaces.

Transverse Section of Lamina: Dorsiventral; widely V-shaped with margins turned slightly downward. Epidermis: cells on both surfaces rounded to dome-shaped; thin-walled. Cuticle: thick and ridged over entire surface. Stomata: present on both surfaces, mostly on abaxial surface; stomata flush with epidermal surface; small substomatal chamber present. Mesophyll: 3 or 4 layers of small palisade-like cells followed by 2 or 3 layers of large rounded cells. Subjacent to these occur 4 layers of small rounded cells. Many cells translucent, especially above midvein. Vascular bundles: 27; commissural bundles observed. One large vessel present in each bundle. Two phloem units lying laterally in flanges of thick, Y-shaped abaxial girder. Slightly thin, inverted Y-shaped adaxial girder present on each bundle. Girders extend to epidermis on both sides. Each bundle completely surrounded by a bundle sheath; cells very large near middle of bundle. Crystals: few present in mesophyll. Tannins: present, especially in epidermis.

TYPE.—In partially shaded crevices of outcrops, sandstone gorge with steep slopes, supporting cerrado and low woods, ca. 5 km north of Grão Mogul, Minas Gerais, Brazil, 1000 m alt, 18 February 1969, Irwin et al. 23491 (NY, holotype; US, photo).

DISTRIBUTION.—Known only from the type-collection.