Blumea 55, 2010: 276 – 277 www.ingentaconnect.com/content/nhn/blumea RESEARCH ARTICLE doi:10.3767/000651910X547101 A new species of Bulbophyllum section Epicrianthes (Orchidaceae) from Papua Province, Indonesia J.J. Vermeulen1, E.F. de Vogel1, A.P.T.M. Vogel2 Key words Bulbophyllum Indonesia New Guinea Orchidaceae Abstract Bulbophyllum dijkstalianum is described, of section Epicrianthes. Within the section, the species is uniquely identified by the stiffly patent rhizome; all other species have a more or less pendulous rhizome. Published on 29 November 2010 Bulbophyllum dijkstalianum J.J.Verm., de Vogel & A.Vogel, sp. nov. (section Epicrianthes) — Fig. 1 In sectione Epicrianthidi rhizoma rigide patenti notata, a B. macneiceae, B. tarantulae, B. trichopalon petalorum appendicibus acuminibus glabris caudatis differt. — Typus: Perry 119 (holo LAE; iso L), Indonesia, Papua, no locality specified. Roots: most emerging close to the base of the rhizome. Rhizome stiffly patent, up to 20 cm long, up to 6 mm diam, sections between pseudobulbs up to 2.2 cm long, bracts persistent, slightly fibrous. Pseudobulbs ellipsoid to ovoid, up to 3 by 1.5 cm. Leaf with petiole up to 5 mm, blade ovate, up to 6 by 4 cm, index (length/width) c. 1.5; acute, abaxially glabrous. Inflorescence 1-flowered. Flowers opening widely. Pedicel and ovary c. 10 mm long. Median sepal somewhat recurved, ovate, c. 12 by 6 mm, index c. 2; acute, margins entire, base broadly attached; thick, glabrous. Lateral sepals as the median, but oblique, recurved, c. 13 by 6.5 mm. Petals recurved, obliquely triangular, c. 3 by 3 mm excluding appendages, index c. 1; margins with 3 similar appendages, thick; appendages ovoid to ellipsoid, 3.2–4 by 1–1.2 mm, abruptly narrowing into a flattened stalk of 1–1.8 mm long, rather abruptly narrowing towards a caudate tip, papillose. Lip somewhat recurved, ovate-triangular, c. 4.5 by 2 mm, index 2.2–2.3 (measured without flattening the lip); subacute, margins entire, glabrous; thick; adaxially concave proximally, the erect margins slightly spreading then slightly converging; with 2 narrow ridges running ± parallel close to the median line, furrow in between distally converting in a row of irregular pits; surface glabrous; abaxially convex and laterally somewhat extending beyond the margins, surface papillose proximally. Column c. 2 mm long, stigma narrowly elliptic, without callus at the base, column foot without teeth near the tip. Stelidia porrect, deltoid, c. 0.3 mm long, rounded, with a minute, obliquely triangular, obtuse tooth just below the tip, and an antrorse, triangular, subacute tooth much lower down. Anther abaxially with a slight crest, surface ± glabrous, front margin drawn out into a rounded beak with erose margins. Pollinia 4; ovoid, without appendage, the inner somewhat more than 0.5 times as long as the outer. 1 2 Eponymy — The species is named in honour of Mr. H.F. Dijkstal for taking the lead in realizing the Netherlands Centre for Biodiversity Naturalis. Colours — Leaves dark green, slightly suffused with purple. Sepals pale yellowish, densely spotted with red. Petals creamcoloured, distally with some red spots, appendages dark red. Lip dark red, base pale yellowish. Habitat & Ecology — Unknown. Distribution — Indonesia, Papua, no locality specified. Note — Uniquely identified within the section by the stiffly patent, not pendulous, rhizome. The flower morphology is most similar to B. macneiceae Schuit. & de Vogel, B. tarantula Schuit. & de Vogel and B. trirhopalon Schltr.; it differs in having the caudate tips to the petal appendages glabrous rather than hirsute. Netherlands Centre for Biodiversity Naturalis (section NHN), Leiden University, P.O. Box 9514, 2300 RA Leiden, The Netherlands; corresponding author e-mail: vermeulen@nhn.leidenuniv.nl. Hortus botanicus Leiden, Leiden University, P.O. Box 9516, 2300 RA, Leiden, The Netherlands. © 2010 Nationaal Herbarium Nederland You are free to share - to copy, distribute and transmit the work, under the following conditions: Attribution: You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Non-commercial: You may not use this work for commercial purposes. No derivative works: You may not alter, transform, or build upon this work. For any reuse or distribution, you must make clear to others the license terms of this work, which can be found at http://creativecommons.org/licenses/by-nc-nd/3.0/legalcode. Any of the above conditions can be waived if you get permission from the copyright holder. Nothing in this license impairs or restricts the author’s moral rights. 277 J.J. Vermeulen et al.: A new species of Bulbophyllum 50 mm a b 5 mm 5 mm c 1 mm 3 mm f 1 mm g d e 3 mm Fig. 1 Bulbophyllum dijkstalianum J.J.Verm., de Vogel & A.Vogel. a. Habit; b. flower; c. flower analysis, from left to right: median sepal, petal, lateral sepal, lip; d. lip, left: adaxial side, right: abaxial side; e. column and lip, lateral view; f. anther, left: adaxial side, right: abaxial side; g. pollinia, left: a single pair, right: two pairs (all: Perry 119 (herbarium, spirit sample)). — Drawn by J.J. Vermeulen, 2010.