Barbacenia tomentosa Mart.

Barbacenia tomentosa Martius

Barbacenia tomentosa Martius, Nov. Gen. & Sp., 1:18, pl. 11, 1823.—Seubert in Martius, Fl. Bras., 3(1):69, 1847.—L. B. Smith, Contr. U.S. Nat. Herb., 35:281, 1962.—Ayensu, Smithsonian Contr. Bot., 15:67, pl. 7c,d, 1974.

Aylthonia tomentosa (Martius) Menezes, Ciência e Cultura, 23(3):422, 1971.

TYPE.—On rocks of micaceous granular schist, between São João del Rei and Villa Rica, (Ouro Preto), and in Diamantina, Minas Gerais, Brazil, Martius s n (M, holotype n v). In the absence of a specimen well typified by the original description and illustration.

DISTRIBUTION.—Brazil: Minas Gerais: on rocks, lower slopes of Pico de Itacolumí, 3 km south of Ouro Preto, 1650 m alt, 1 February 1971, Irwin, Harley & Omishi 29559 (NY, UB, US).

80. Barbacenia cyananthera L. B. Smith & Ayensu, new species

A B. tomentosa Martius, cui affinis, foliorum laminis glabris, tepalis subduplo majoribus, appendicibus coronoideis valde majoribus differt.

Caudex very short. Leaves subrosulate; sheaths covered; blades linear, evenly attenuate, 12 cm long, 6 mm wide, sulcate on both sides, setose-ciliate, otherwise even and glabrous.

Scapes solitary, 4–5 cm long above the leaf-sheaths, laxly pale-pubescent. Flowers scarlet (!Irwin et al.), laxly pale-pubescent. Ovary turbinate, indistinct, ca. 12 mm long. Perianth-tube (whole) slenderly cylindric, 30 mm long, 5 mm wide. Tepals uniform, oblong, obtuse, 20 mm long. Anthers ca. 6 mm long, attached near their base to near apex of appendage; coronoid appendage subtriangular, acutely bilobed, ca. 6 mm long. Style much exceeding stamens, ellipsoid-enlarged at apex and almost wholly covered by the confluent stigmas.

LEAF ANATOMY (Irwin, Maxwell & Wasshausen 19834).—Surface View: Hairs: few tufts observed. Epidermis: cells on both surfaces 4- to 6-sided; thin-walled. Stomata: tetracytic; 24 × 18 μm; present in rows on both surfaces.

Transverse Section of Lamina: Dorsiventral; very widely V-shaped. Few tufts of hairs present on both surfaces and at extreme margins. Epidermis: cells on both surfaces small; rounded to dome-shaped; few conical; thin-walled. Cuticle: thin and smooth on most of surface; thicker above and/or below few bundles. Stomata: present on both surfaces; stomata flush with epidermal surface; small substomatal chamber present. Mesophyll: 3 or 4 layers of small palisade cells followed by 3 or 4 layers of large, rounded, translucent cells. Below this occur 4 or 5 layers of small, rounded, compactly arranged spongy tissue. Vascular bundles: 19; commissural bundles observed. One or two large vessels present in each bundle, mostly one. Two phloem units lying laterally in flanges of thick, Y-shaped abaxial girder which extends to the abaxial epidermis. Relatively thin, inverted Y-shaped adaxial girder present on each bundle, extending to adaxial epidermis. Each vascular bundle completely surrounded by a bundle sheath. Crystals: few present in mesophyll. Tannins: present.

TYPE.—Extensive mats on rocks, steep slopes, Pico de Itabirito, ca. 50 km southeast of Belo Horizonte, Minas Gerais, Brazil, 1750 m alt, 11 February 1968, Irwin, Maxwell & Wasshausen 19834 (NY, holotype; UB; US, isotypes).

DISTRIBUTION.—Known only from the type-collection.

Barbacenia tomentosa Martius

SPECIMENS EXAMINED.—Irwin et al. 29559; Menezes 1.

SURFACE VIEW.—Hairs: present on adaxial and abaxial surfaces; multicellular. Epidermis: cells on adaxial and abaxial surfaces square to rectangular, few rounded; thin walled. Stomata: tetracytic, 24 × 9 μm; present on adaxial and abaxial surfaces.

TRANSVERSE SECTION OF LAMINA.—Dorsiventral;

wide V-shaped. Both adaxial and abaxial surfaces with ridges or small furrows. Tufts of multicellular hairs present on both surfaces. Epidermis: adaxial cells dome shaped, few conical, thin walled; abaxial cells dome shaped, few conical, thin walled. Subjacent to adaxial epidermis is a layer of thin-walled parenchyma cells. Cuticle: very thin on adaxial and abaxial surfaces. Stomata: present in abaxial furrows and on adaxial surface; substomatal chamber present. Mesophyll: small, rectangular, palisade-like cells, closely packed. Abrupt change to loosely arranged spongy tissue with some large translucent cells. Vascular bundles: 43–44; few commissural bundles observed. Usually one large vessel present in each vascular bundle. 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 in mesophyll.