Porpax atrorubra (Mansf.) Schuit., Y.P.Ng & H.A.Pedersen, Bot. J. Linn. Soc. 186: 199 (2018).
Homotypic Names:

Stolzia atrorubra Mansf., Notizbl. Bot. Gart. Berlin-Dahlem 11: 1063 (1934).
A small creeping epiphytic herb to 6 cm. high. Pseudobulbs rather elongate-ovoid, dorsiventrally flattened, closely spaced, 1.5 cm. long, 0.7 cm. high, 1-2-leaved at apex. Leaves oblong-elliptic, fleshy, 4-5 cm. long, 0.9-1.2 cm. wide, rounded at apex, emarginate, articulated to a short leaf-base 0.6 cm. long. Inflorescence erect, densely 2-6-flowered, to 3.5 cm. long; peduncle short, 0.5-0.8 cm. long; bracts lanceolate, to 0.7 cm. long. Flowers secund, dull red. Sepals lanceolate, 0.9 cm. long, 0.35 cm. wide, acuminate; lateral sepals oblique. Petals curvate-lanceolate, 0.75 cm. long, 0.2 cm. wide, acuminate. Lip curved, oblong-ovate when spread, V-shaped, canaliculate in cross-section, densely papillate above and beneath, 0.33 cm. long, 0.2 cm. wide, acute. Column fleshy, truncate, 0.15 cm. long; foot 0.35 cm. long, curvate; anther-cap subhemispherical, verrucose.
On mossy rocks and branches in upland mist forest; 1800-2400 m.
Tanzania (Uluguru Mts.)
Flora of Tropical East Africa: Orchidaceae, Part 2
Click on each image to see a larger version.