Barbacenia hatschbachii L. B. Sm. & Ayensu

Barbacenia hatschbachii L. B. Smith & Ayensu

SPECIMENS EXAMINED.—Hatschbach 24284.

SURFACE VIEW.—Hairs: none present. Epidermis: adaxial and abaxial cells square to rectangular; thin walled. Stomata: paracytic, 30 × 15 μm; present on abaxial surface.

TRANSVERSE SECTION OF LAMINA.—Isolateral; V-shaped with slight median adaxial groove. Margins of lamina turned slightly inversely. Both adaxial and abaxial surfaces slightly undulating. Epidermis: adaxial cells dome shaped; few conical; thin walled. Abaxial cells rounded to dome shaped; thin walled. Subjacent to adaxial epidermis is a distinct layer of parenchyma cells. Cuticle: thick and ridged on adaxial and abaxial surfaces. Stomata: present on abaxial surface; small substomatal chamber present. Mesophyll: palisade cells nonexistent; mesophyll almost entirely made up of spongy tissue with especially large thin-walled translucent cells. Vascular bundles: 35; few commissural bundles observed. One large vessel present in each vascular bundle. Two phloem units lying laterally in flanges of Y-shaped abaxial girder. T-shaped adaxial girder present on each vascular bundle. Bundle sheath completely surrounding each vascular bundle. Crystals: none observed. Tannins: few present.