Barbacenia fragrans Goethart & Henrard

Barbacenia fragrans Goethart & Henrard

SPECIMENS EXAMINED.—Dueke s.n.; Regnell 1239; Widgren s.n. US 933895.

SURFACE VIEW.—Hairs: numerous, spreading over entire surfaces. Epidermis: adaxial cells square to rectangular; abaxial cells rounded to square, few rectangular; cell walls thin. Stomata: paracytic, 12 × 12 μm; present on abaxial and adaxial surfaces.

TRANSVERSE SECTION OF LAMINA.—Dorsiventral; widely V-shaped with margins turned inversely. Adaxial surface slightly undulating; abaxial surface quite ridged. Epidermis: cells on adaxial and abaxial surfaces are dome shaped to conical; thin walled. Subjacent to adaxial epidermis is a layer of parenchyma cells. Cuticle: thin and ridged on both surfaces. Stomata: present on abaxial and adaxial surfaces; substomatal chamber present. Mesophyll: two- to three-layered palisade cells grading into loosely arranged spongy tissue containing large translucent cells. Vascular bundles: 37–47; no commissural bundles observed. One to two large vessels present in each vascular bundle, mostly one. Two phloem units lying laterally in flanges of Y-shaped abaxial girder extending to abaxial epidermis. Inverted Y-shaped adaxial girder present on each vascular bundle. Bundle sheath completely surrounding each vascular bundle. Crystals: none observed. Tannins: numerous, mostly in mesophyll.

Barbacenia gardneri Seubert in Martius

SPECIMENS EXAMINED.—Pereira 2849–Pabst 3685.

SURFACE VIEW.—Hairs: long, thin, multicellular hairs present on adaxial surface. Epidermis: cells square to rectangular on both adaxial and abaxial surfaces; few rounded; thin walled. Stomata: paracytic, 18 × 12 μm; present on both adaxial and abaxial surfaces.

TRANSVERSE SECTION OF LAMINA.—Dorsiventral; V-shaped with extreme margins of lamina turned slightly inversely. Both abaxial and adaxial surfaces slightly undulating; abaxial a little more than adaxial. Epidermis: adaxial cells rounded, dome shaped and conical, few crescent shaped; walls thin. Abaxial cells dome shaped to conical; walls thin. Cuticle: very thin and following contour of cells on both surfaces. Stomata: present on both adaxial and abaxial surfaces; substomatal chamber quite large on both surfaces; either flush with or slightly above epidermal surface. Mesophyll: two to three layers of small palisade cells changing abruptly to large, rounded translucent cells with thickened walls occurring in middle of mesophyll, especially next to the vascular bundles. Cells change abruptly to two or three layers of small rounded cells on the abaxial side. Very large midvein cells abruptly changing into small cells toward abaxial side. Vascular bundles: 48; many commissural bundles observed. One to three large vessels present in each bundle, mostly one. Two phloem units in flanges of V- or Y-shaped abaxial girder. Inverted Y-shaped adaxial girder present on each vascular bundle. Bundle sheath completely surrounding each vascular bundle. Crystals and tannins: none observed.

Barbacenia fragrans Goethart & Henrard

Barbacenia fragrans Goethart & Henrard, Blumea, 2:345, 1937.—L. B. Smith, Contr. U.S. Nat. Herb., 35:282, 1962.—Ayensu, Smithsonian Contr. Bot., 15:63, figs. 2d, 24a–c, pls. 9a, 22a, 1974.

TYPE.—On dry rocks, sometimes in moist cracks in rocks, Caldas, Minas Gerais, Brazil, 1 February 1876, Mosén 4444 (S, holotype).

DISTRIBUTION.—Brazil: Minas Gerais: Caldas. São Paulo: São João da Boa Vista.