Lepanthes sabinadaleyana is most similar to L. lycocephala Luer & R.Escobar, both bearing small reddish flowers with longitudinally concave lip blades with everted apices, but the lip in L. sabinadaleyana has oblong-obovate blades with an ovoid, obtuse appendix.Plant epiphytic, sympodial, caespitose herb up to 9 cm tall. Rootsca. 0.7 mm in diameter. Ramicaulsslender, erect to horizontal, elongated, thin, 7–12 cm long, enclosed by 6–11 microscopically scabrous, tightly fitting acuminate lepanthiform sheaths. Leafgreen, thinly coriaceous, narrowly ovate, acute, attenuate, 3.0–3.5 × 0.7–0.8 cm, the base broadly cuneate, contracted into a petiole ca. 2 mm long. Inflorescence a congested, distichous, successively flowered raceme up to 7 mm long, borne by a filiform peduncle 11–12 mm long, resting on the adaxial surface of the leaf. Floral bracts spiculate,
1 mm long; pedicels 1.5 mm long. Ovary costate, 1.5–1.7 mm long. Flower with sepals translucent rose, petals, column and lip rose, anther cap white, suffused with rose. Sepals similar in shape and size, carinate along the veins on the abaxial surface; dorsal sepal ovate, cuspidate, slightly concave, 3-veined, 4.0 × 2.5 mm, connate to the lateral sepals for 0.5 mm; lateral sepals connate 1.5 mm into a broadly ovate bifid synsepal, 3.0–3.5 × 3.5 mm, each individual sepal free for ca. 1 mm, 2-veined with the apices cuspidate. Petals transversely bilobed, pubescent, shallowly retuse at the apex between the two lobes, 0.5 × 2.5 mm, the upper lobe triangular, deflexed, acute, 1.5 mm long, the lower lobe triangular, subacute, 1 mm long. Lipbilaminate, the blades diverging, thickened towards the apex, pubescent, oblong-obovate, longitudinally concave, 1.5 mm long with everted, rounded apices; the connectives ca. 0.5 mm long, cuneate; the body triangular when expanded, adnate to the base of the column; the appendix ovoid, pubescent, glandular and rounded at the apex. Column terete, 1.5 mm long, the anther and stigma apical. Pollinia2, pyriform, attached to a detachable viscidium, 0.5 mm long. Anthercap cucullate, 0.5 mm long. Capsule 4.2 mm long.