Porpax viridis (P.J.Cribb) Schuit., Y.P.Ng & H.A.Pedersen, Bot. J. Linn. Soc. 186: 200 (2018).
Homotypic Names:

Stolzia viridis P.J.Cribb, Kew Bull. 33: 87 (1978).
A creeping epiphytic herb to 15 cm. high. Pseudobulbs obliquely ovoid-fusiform, to 2.5 cm. long and 1.5 cm. high, 2-leaved at off-centre apex. Leaves ligulate to elliptic-oblong, erect, bright green, to 12 cm. long and 1.7 cm. wide, rounded and emarginate at apex. Inflorescence ± equal to leaves, erect, densely 6-14-flowered, to 11 cm. long; peduncle flattened, 3-5 cm. long; bracts lanceolate, 0.7 cm. long, acute to acuminate. Flowers secund, lime-green with a purple lip. Dorsal sepal ovate-elliptic, 0.6 cm. long, 0.3 cm. wide, obtuse, margin slightly ciliate; lateral sepals similar but obliquely ovate and acute, fused to each other in basal half and forming a saccate mentum with the column-foot. Petals narrowly elliptic, 0.4 cm. long, 0.2 cm. wide, rounded, margin obscurely ciliate. Lip ovate when flattened, fleshy, sulcate at base, 0.25 cm. long, 0.15 cm. wide, rounded at apex. Column truncate, 0.15 cm. long; rostellum broad, flap-like; stigma orbicular; anther-cap rounded, verrucose.
On mossy branches in wet mist forest; 1600-2000 m.
Tanzania (Uluguru Mts.)
Flora of Tropical East Africa: Orchidaceae, Part 2; A revision of Stolzia (Orchidaceae) Kew Bulletin 33(1) Page 88.
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