Bulbophyllum subium J. J. Verm., Schuit. &amp; de Vogel, sp. nov.
Creators: name: Vermeulen, Jaap J.
name: Schuiteman, André
name: De Vogel, Edward F.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Asparagales
Orchidaceae
Bulbophyllum
Bulbophyllum subium

description: <i>Bulbophyllum subium</i> J.J.Verm., Schuit. &amp; de Vogel, <i>sp. nov.</i> (Fig. 9) TYPE: Indonesia, Papua Province, Mimika Regency, PT-Freeport Indonesia Concession Area, below Hanekam Tunnel, 2500 m alt., 15 Oct. 1998, <i>Johns 9057</i> (holotype K!, isotypes BO, L!, MAN, FREE). DIAGNOSIS. Shares the clustered growth, combined with narrow sepals and short, upwards falcate stelidia with <i>Bulbophyllum galliaheneum</i> Van Royen, from which it differs by the elliptic to ovate, acute (versus obovateoblong, subtruncate to rounded) petals, by the much denser and larger hirsute patches proximally on the adaxial side of the lip, and by the triangular (versus narrowly triangular and distally subulate) stelidia; and with <i>B. odontopetalum</i> Schltr., from which it differs by the elliptic to ovate, minutely erose and/or ciliolate (versus obovate-spathulate, coarsely fimbriate) petals, and by the hirsute (versus glandular-papillose) lip margins. Small epiphyte with creeping rhizomes and spreading roots. <i>Rhizome</i> ca. 2.5 mm diam., sections between pseudobulbs 0.3–0.5 cm long, arising from the basal node of the pseudobulb; rhizome scales thin, little persistent. <i>Pseudobulbs</i> distinct, ellipsoid, 1.0– 1.2 × 0.3–0.4 cm, hardly angular but concave on the side where the new shoot arises. <i>Leaf</i>: petiole 0.5–1.5 mm long; blade elliptic to obovate, 2.9–6.0 × 0.5–0.7 cm, ratio length/width 4.1–12; subacute. <i>Inflorescences</i> single or several together, ca. 8 cm long, 1-flowered. Peduncle ca. 4.5 cm long, scales ca. 4. <i>Floral bracts</i> ca. 4.0 mm long. <i>Flowers</i>: pedicel plus ovary ca. 9 mm long, basal node ca. 2 mm above the floral bract attachment. <i>Median sepal</i> free, recurved, ovate, ca. 22 × 3.2 mm, ratio length/width 6.8–6.9; long-acuminate, margins entire, ciliolate, surface glabrous; 3-veined. <i>Lateral sepals</i> as the median but ovate-triangular, ca. 28.5 × 3.0 mm, ratio length/width ca. 9.5. <i>Petals</i> porrect, elliptic to ovate, 3.1–4.5 × 1.0– 1.1 mm, ratio length/width 2.8–4.5; acute, margins minutely erose and/or ciliolate, surface glabrous; 1-veined. <i>Lip</i> slightly recurved near base, elliptic to oblong, 4.6–5.0 × 1.3–1.8 mm, ratio length/width 2.5–3.9 (without spreading); rounded, margins entire, approx. densely hirsute proximally, glabrous distally; thick; adaxially concave close to the base, this cavity with a proximally widening, glabrous median crest which continues up to 1/3–2/5 of the length of the lip, the cavity bordered by two short, converging ridges with a densely papillose crest, adaxial surface otherwise slightly concave and with two densely hirsute patches towards the margins in the proximal 1/3–2/5 of its length, slightly convex and slightly papillose elsewhere; abaxially convex and shortly hirsute with scattered glandular papillae near the base, slightly concave and glabrous elsewhere. <i>Column</i> including stelidia 0.9–1.2 mm long, stigma elliptic, proximally distinctly protruding from the column face, foot deeply furrowed, distally distinctly widened, with spreading, obtuse lateral teeth. Stelidia upwards falcate, triangular, 0.3–0.4 mm long, acute. <i>Pollinia</i> 4. COLOURS: flowers dark red-purple. ETYMOLOGY: <i>subium</i> (Latin) = moustache, referring to shape of the hairy patches on the lip (the word is used as a noun in apposition. HABITAT AND ECOLOGY: epiphyte in <i>Casuarina</i> forest. Elevation 2500 m.
description: Published as part of <i>Vermeulen, Jaap J., Schuiteman, André &amp; De Vogel, Edward F., 2020, Sixteen new species of Bulbophyllum section Polymeres (Orchidaceae) from New Guinea, pp. 301-330 in Lankesteriana 20 (3)</i> on page 315, DOI: 10.15517/lank.v20i3.44438, http://zenodo.org/record/4455665