Barbacenia macrantha Lem.

Barbacenia macrantha Lem

SPECIMENS EXAMINED.—Irwin, Maxwell, and Wasshausen 20071.

SURFACE VIEW.—Hairs: numerous on both surfaces. Epidermis: adaxial cells rectangular; abaxial cells rounded, some square. Walls thin on both surfaces. Stomata: paracytic, 12 × 6 μm; present on abaxial surface.

TRANSVERSE SECTION OF LAMINA.—Dorsiventral; V-shaped with margins of lamina turned inversely. Both adaxial and abaxial surfaces slightly undulating; large numbers of hairs present on both surfaces. Epidermis: thin cell walls on abaxial and adaxial surfaces rounded to dome shaped; few conical. Cuticle: on abaxial and adaxial surfaces thin and ridged. Stomata: present on abaxial surface; substomatal chamber present. Mesophyll: two to three layers of palisade cells grading into spongy tissue. Some large translucent cells present in spongy tissue. Vascular bundles: 41; no commissural bundles observed. One to two large vessels present in each vascular bundle. Two phloem units lying laterally in flanges or V- or Y-shaped abaxial girder. Inverted Y-shaped adaxial girder present on each vascular bundle. Crystals: none observed. Tannins: present and in numerous quantities, especially in palisade cells.

Barbacenia macrantha Lemaire

Barbacenia macrantha Lemaire, Jard. Fl., 4:pl. 390, 1854.— L. B. Smith, Contr. U.S. Nat. Herb., 35:279, 1962.—Ayensu, Smithsonian Contr. Bot., 15:65, fig. 2f, pls. 8a,b, 48d, 1974.

Aylthonia macrantha (Lemaire) Menezes, Ciência e Cultura, 23(3):[421], 1971.

TYPE.—On rocks, Diamantina, Serra do Cipó, Minas Gerais, Brazil, Libon s n, cultivated by De Jonghe (BR(?) n v, in the absence of any specimen amply typified by the original description and illustration).

DISTRIBUTION.—Brazil: Minas Gerais: Diamantina, Conceição do Mato Dentro.