Appendicula brassii Ormerod, drawing by Paul Ormerod in Malesian Orchid J. 13 (2014) 44, fig. 4, based on L.J. Brass 12236 (holo AMES).
Type: L.J. Brass 12236 (holo AMES).
Epiphytic herb. Rhizome short. Roots terete, densely pubescent, 0.05–0.15 cm thick. Stem simple to 1-branched, terete, densely leafy throughout, 31.5–62.3 by 0.15 cm; branchlet 9.0–12.5 cm long. Leaves oblong, 1.5–3.7 by 0.5–0.95 cm; leaf sheaths tubular, truncate, smooth, striate when dry; exposed part 0.5–0.8 cm long; apex biaristate, retuse. Inflorescence pseudoterminal, 2.6–4.7 cm long; peduncle 0.9–1.2 cm long; sheaths 2–3, somewhat subfoliaceous, to 1.15 cm long, with scarious margins, often ciliate-erose; rachis weakly flexuous, rather laxly successively 2–3-flowered, 1.5–3.2 cm long; floral bracts oblong-rhombic (possibly cymbiform), with scarious margins, ciliate-erose to lacerate, to 1.1 by 0.5 cm. Pedicel and ovary clavate, 0.5 cm long; ribs sharply keeled. Median sepal broadly lanceolate, 0.62 by 0.275 cm; midnerve strongly keeled; apex acute; 3-nerved. Lateral sepals obliquely ovate-lanceolate, c. 0.9 by 0.36 cm (0.62 cm long along midnerve); midnerve strongly keeled; margins joined at front for c. 0.32 cm; apex acute; mentum subglobose, 0.2 by 0.3 cm. Petals ligulate, 0.525 by 0.15 cm; apex acute, with one branching vein. Lip c. spathulate on outline, 0.75 by 0.35 cm; claw cuneate, in narrowest part c. 0.11 cm wide; blade ovate, with obtuse-subacuminate apex, 3-nerved; margins below blade minutely cellular-denticulate; callus oblong, canaliculate, its base with 2 cornute, retrorse lobules, median emarginate at the base, continuing onto the disc as 2 thick subsigmoid keels. Column obliquely erect, c. 0.38 cm long; rostellum with lanceolate, acute arms, with deeply bifid apex; column foot C-shaped, 0.3 cm long.