Bulbophyllum irianae De Vogel, Suhartawan, Hoogendijk & Heatubun, OrchideenJ. 6, 5 (2018) 3, fig. (E-published 5-X-2018)
Type: Keerom cult. s.n. (De Vogel, Suhartawan & Hoogendijk) (holotype Yayasan Pendidikan Alam Papua, temporarily stored in Universitas Cenderawasih)
Epiphyte, creeping. Roots terete, minutely pustulate, c. 0.08 cm diam. Rhizome c. 0.3 cm diam.; rhizome scales not persistent. Pseudobulbs 0.6-1 cm apart, ascending, hardly narrowing to the top, dorsoventrally flattened, 0.6-1 by 0.2-0.4 cm, to c, 0.2 cm thick, finely irregularly longitudinally grooved. Leaf thick coriaceous, 4.7-10.2 by 2.1-2.6 cm; petiole 0.2-0.7 by 1.5-2 cm; blade elliptic, 4.5-10 by 1.4-2.6 cm, index 3.1- 3.8, with rounded apex. Inflorescence c. 11.7 cm long, 1-flowered; peduncle c. 7.7 cm long cm long; peduncle scales 3; tubular, the upper one with a long acuminate top; floral bract tubular, c. 0.7 cm long, with a long acuminate top; node displaced c. 0.9 cm. Pedicel and ovary c. 4 cm long; the ovary c. 0.6 cm, with 6 grooves. Median sepal porrect, c. 1.6 by 0.35 cm, index c. 4.57, entirely glabrous; widened basal part elliptic, thin and convex, c. 0.8 cm long, index c. 2.29, with entire margins, nerves 3,-raised, the lateral nerves with one branch from near the base; apex a long, solid, terete, subulate awl c. 0.8 cm long, which is adaxially in the lower half flat, without crest or keel, continuously and gradually narrowing in the very thin tip. Lateral sepals free, c. 8.2 by 0.6 cm, index c.13.5, entirely glabrous but basal half on inner side slightly rugulose; basal part widened, oblique and somewhat falcate near the base, c. 2.5 cm long, long ovate, index c. 4.2, with upper margin minutely irregular, lower margin smooth, 4-nerved with the upper 2 nerves and the lowermost nerve branching at the very base; apical part long drawn-out, narrow, c. 5.5 by 0.07-0.1 cm, with c. parallel margins, its basal part thin, the top 4 cm subulate and c. semi-terete, spiraling around each other with c. 6 turns, with acute apex. Petals porrect, obovate-oblong, c. 0.52 by 0.17 cm, index c. 3, entirely glabrous; margins entire, smooth; apex acute to acuminate, curved downwards; 3-nerved, the median nerve more pronounced. Lip recurved over its entire length, c. narrowly ovate with a slightly widened base, c. 0.33 by 0.09 cm, index c. 3.7 (without artificial spreading), entirely glabrous; margins entire, at the back of the lip elevated with sharp margins; upper side smooth, without ornamentation; below with a broad high base which is elevated where the ligament is attached and which narrows and lowers to near the top of the lip into a high crest; apex narrowly triangular, acute. Column c. 0.27 cm long; rostellum not protruding; stigma elliptic; column foot c. 0.25 cm long, its apex free for c. 0.1 cm strongly curved upwards, somewhat widened; stelidia porrect, triangular, acute.
(after Schuiteman, de Vogel, Heatubun, Wamma, Mambor, Suhartawan & Hoogendijk 2018)