Barbacenia seubertiana Goethart & Henrard

Barbacenia seubertiana Goethart & Henrard

Barbacenia seubertiana Goethart & Henrard, Blumea, 2:360, 1937.—L. B. Smith, Contr. U.S. Nat. Herb., 35:276, 1962.—Ayensu, Smithsonian Contr. Bot. 15:56, fig. 19a–c, 38c–e, 1974.

Barbacenia purpurea Hooker var. minor Seubert in Martius, Fl. Bras. 3(1):68, 1847 [type: Serra dos Orgãos, Rio de Janeiro, Brazil, Gardner 5897 (K, holotype, not seen)].

TYPE.—On rock, summit of Serra dos Orgãos, Rio de Janeiro, Brazil, 6 March 1888, Glaziou 17824 (L, holotype; B, photo s n).

DISTRIBUTION.—Brazil: Rio de Janeiro city and state.

Barbacenia seubertiana Goethart & Henrard

SPECIMENS EXAMINED.—Lanna-Sobro 4488; Strang 239, 523; Goethart and Henrard 4332.

SURFACE VIEW.—Hairs: absent. Epidermis: adaxial cells rounded; abaxial cells square to rectangular;

walls thin on both surfaces. Stomata: paracytic, 21 × 9 μm; present on abaxial surface.

TRANSVERSE SECTION OF LAMINA.—Isolateral; V-shaped. Adaxial and abaxial surfaces slightly undulating. Epidermis: cells on adaxial surface rounded to dome shaped; cells on abaxial surface dome shaped to conical; cell thin walled. Layer of parenchyma cells subjacent to epidermis. Cuticle: thin and ridged on abaxial and adaxial surfaces. Stomata: present on abaxial surface; small substomatal chamber present. Mesophyll: three to four layers of palisade-like cells grading into spongy tissue. Three to four layers of large mesophyll cells in midportion of lamina. Some translucent spongy tissue present on adaxial side of midvein. Vascular bundles: 19–57; commissural bundles not observed. One to two large vessels present in each vascular bundle; mostly one. Two phloem units laterally arranged 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: few in mesophyll.