Barbacenia paranaensis L. B. Sm.

Barbacenia paranaensis L. B. Smith

SPECIMENS EXAMINED.—Hatschbach 15715.

SURFACE VIEW.—Hairs: numerous, present on both surfaces. Epidermis: adaxial cells rounded. Abaxial cells square to rectangular. Walls thin. Stomata: paracytic, 18 × 15 μm; present on abaxial surface.

TRANSVERSE SECTION OF LAMINA.—Dorsiventral; widely V-shaped. Adaxial and abaxial surfaces undulating. Epidermis: cells on adaxial and abaxial surfaces rounded to dome shaped; thin walled. Multicellular hairs present on epidermal surfaces. Cuticle: very thin on both surfaces; ridged. Stomata: present on adaxial surface; substomatal chamber present. Mesophyll: three- to four-layered palisade cells changing abruptly into compactly arranged spongy tissue. Two to three layers of large translucent cells arranged radially above midvein. Some large translucent spongy cells present in midportion of mesophyll. Vascular bundles: 43; few commissural bundles observed. One large vessel present in each vascular bundle. Two phloem units arranged 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: not observed. Tannins: present, especially in midportion of mesophyll.

Barbacenia paranaensis L. B. Smith

Barbacenia paranaensis L. B. Smith, Contr. U.S. Nat. Herb., 35:280, pl. 10: figs. 25, 26, 1962.—Ayensu, Smithsonian Contr. Bot., 15:66, pls. 20a, 48e, 1974.

Aylthonia paranaensis (L. B. Smith) Menezes, Ciência e Cultura, 23(3):422, 1971.

TYPE.—On sandstone (arenite) bluffs, Fazenda Morungava, Rio de Funil, Mun. Sengés, Paraná, Brazil, 15 December 1958, Hatschbach & Lange 5359 (US, holotype; MBM, isotype).

DISTRIBUTION.—Brazil: Paraná: Ortigueira, Sengés.