Porpax thaithongiae  

Plant epiphytic, clump-forming on the substrate, 2.5–5 cm tall. Pseudobulbs flattened triangular to globose, 0.8–1.6 cm in diam., covered by a sheath which disintegrate into a fibrous reticulate network. Foliage leaves 2 per pseudobulb, often appearing after the flower, elliptic to oblong, 0.8–3.5 by 0.6–1.2 cm, apex acute, base tapering to a petiole, lamina dull green, with faint longitudinal lines; petiole 2–3 mm long. Inflorescence short, arising from base of pseudobulb, 1-flowered; peduncle very short; floral bracts conspicuous, ovate to rounded, 3–6.5 by 2–5 mm, apex acute, covering ovary. Flower 0.8–1 cm long, dull red, occasionally yellow; pedicel and ovary short. Sepals connate into a subcampanulate tube, wide open, usually with several shallow keels outside, glabrous, gibbous at base; lobes broadly ovate, apiculate at apex. Petals ovate, 2.5–3 by 1.8–2.5 mm, 3-nerved, apex acute and finely rugose, broadly clawed at base. Labellum simple, ovate, 2.8–3.5 by 2–2.5 mm, recurved, distinctly 3-nerved, warty and shortly laciniate along margins; disk ornamented by irregular calli. Column 1.5–2 mm long, foot long; rostellum large, truncate; operculum tuberculate; pollinia 8, in 2 groups of 4, laterally compressed. Capsule subglobose, 6–7 mm in diam., with 3 longitudinal ridges.