Appendicula ancosiphila Ormerod, Malesian Orchid J. 13 (2014) 42, fig. 3.
Type: L.J. Brass 12224 (holo AMES).
Epiphytic herb. Rhizome short. Roots terete, pubescent, to 0.05 cm thick. Stems terete, to 42 by 0.075–0.08 cm, densely leafy throughout, older stems gradually shedding leaves; in upper part branchlets 2–8, 3.5–15 cm long. Leaves ligulate-lanceolate, 1–2 by 0.22–0.35 cm; leaf sheaths tubular, truncate, striate (in dry state), exposed part 0.2–0.6 cm long; basal part of blade 0.2–0.3 cm appressed to the stem; apex with a c. 0.1 cm long apiculus. Inflorescence pseudoterminal, 1.6–2 cm long; peduncle 1 cm long; rachis fractiflex, somewhat successively 4–5-flowered, 0.65–1 cm long; floral bracts ovate-rhombic, to 0.7 by 0.2 cm, the margins midway erose to irregular, with acute apex. Pedicel and ovary clavate, 0.36 cm long. Median sepal ovate, 0.34 by 0.21 cm; apex subacute. Lateral sepals obliquely ovate; apex subacute midnerve thickly keeled, 0.59 by 0.22 cm (0.42 cm long along midnerve); mentum subquadrate, c. 0.17 by 0.18 cm. Petals obliquely oblong, 0.275 by 0.12 cm; apex acute; 1-nerved. Lip 0.5 cm long; “claw” oblong, formed by the erect sides embracing the callus, c. 0.23 by 0.08 cm; blade elliptic, c. 0.27 by 0.22 cm, with obtuse apex; 3–4-nerved; margins finely papillose-pubescent in lower half; callus oblong-cuneate, base deeply V-shaped, fleshy. Column stout, obliquely erect, 0.2 cm long; anther cap widely ovate-reniform, with apex shortly bidentate; column foot with finely papillose-pubescent margins, c. 0.2 cm long.