Dendrobium ormerodii Naive, Handoyo & Champion, 2021

Ditemukan di Batapah, Kalimantan Tengah, Indonesia. Tumbuh sebagai epifit di hutan dataran rendah yang ternaungi, pada ketinggian 100-400 m. Dalam pemeliharaan species ini dapat tumbuh pada ketinggian 1.100 m dapl.

Phenology:: Bunga muncul pada bulan Februari - April.

Etymology : "omerodii" diberikan untuk menghormati Paul Abel Ormerod (1969-), yang berjasa besar dalam dunia peranggrekan di Asia dan Australia.

Description: Epiphytic herbs. Roots 1.0– 1.4 mm in diameter, verrucose, greenish white, becoming brown when old. Stem clustered, erect to semi pendant, up to 30 cm long, basal 5 cm cylindrical, the remaining length flattened, subclavate, distinctly grooved, brown to greenish brown; internodes 8–13, (12–17) 22–27 mm long, (1.2–1.8) 7–8 mm in diam., covered with persistent sheaths. Leaves distichous, 6.5–8.0 cm long by 1.0– 1.3 cm wide (largest leaf), linear lanceolate, dark green suffused with purple, chartaceous, glabrous on both sides, margin entire, apex acute; sheath longer than the internode, striate, green with purplish red streak when young, grey to brownish green when old. Inflorescences shortly racemose, mostly borne from upper leafless stem, 1–2 per node bearing 2–5 flowers, 1.2–1.5 cm long, peduncle and bracts persist after flowering, peduncle suberect to pendant, terete, glabrous, brownish green; floral bracts 1–2 mm long, triangular, greenish brown to vermillion, glabrous on both sides, margin entire, apex attenuate. Flower lasting 4–6 days, 2.2–2.4 cm long, 1.8–2.0 cm across, not opening widely, amber, sepals richly stippled with purple outside, petals with a narrow purple midline or midnerve, mentum suffused with purple, lip with purple red blotches except the creamy white apex, column and column foot with purple marks or markings. Pedicel with ovary 8–12 mm long, cylindrical, sulcate, reddish green with purple streak, curved. Dorsal sepal 5-nerved, porrect, 10.0– 10.2 mm long by 3.9–4.1 mm wide, ovate, glabrous on both sides, margin entire, apex acute. Lateral sepals 6-nerved, spreading, inner margin 10.0– 11.4 mm long, outer margin 17.0– 17.6 mm long, 5.0– 5.5 mm wide, obliquely triangular, falcate, margin entire, apex acute, cucullate. Mentum narrowly conical, 9.0– 10.2 mm long, 4.2–4.4 mm across at the widest point, 2.6–2.8 mm wide at the apex, somewhat incurve, apex truncate to obtuse. Petals 5-nerved, spreading, 12.0– 12.4 mm long by 3.0– 3.4 mm wide, oblong to narrowly obovate, apex acute, curved upwards. Lip 2.0– 2.2 cm long, rhombic from a short claw, erect, concave, shortly clawed or unguiculate; claw ligulate-oblong, fleshy, basal 1–2 mm adnate to the column foot, free part 5–6 mm long, in total ca. 6–7 mm long by 1.7–2.0 mm wide; blade not trilobed, broadly ovate to elliptic (when flattened), 14–15 mm long by 8–9 mm wide at the centre, 4.0– 4.5 mm wide at the apex (when flattened), glabrous on both sides, shortly ventricose to excavate-concave below, suberect, apex recurved, margin minutely erose to entire, undulate, obtuse-truncate; disc thick, with 3–5 low longitudinal callus ridges from the centre to the apex of blade. Column porrect, stout, 2.0– 2.5 mm long, 2.0– 2.2 mm in diam. at base; column foot 9.4–10.0 mm long, slightly incurved; stelidia triangular, 0.5 mm long, whitish with purple markings, obtusely acute; stigma oblong, 0.8–1.0 mm in diam.; rostellum absent; pollinia 4, in two pairs, each pair can be divided into two parts, c. 0.8 mm long; anther cap 1.7 mm long, 1.3 mm across, ovate, white, cucullate. Capsule not seen.

Conservation status : ‘Data Deficient’ (DD) following IUCN (2019).

Mark Arcebal K. Naive, Frankie Handoyo and Jeffrey Champion. 2021. Dendrobium ormerodii (Orchidaceae, Dendrobieae), A New Dendrobium Species from Central Kalimantan, Indonesia. Phytotaxa. 524(3); 205-209. DOI: Phytotaxa.524.3.5; twitte orchidARCIIae