Bulbophyllum ischyron 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 ischyron

description: <i>Bulbophyllum ischyron</i> J.J.Verm., Schuit. &amp; de Vogel, <i>sp. nov.</i> (Fig. 4) TYPE: Indonesia, Papua Province, Damarga Lakes, 2500–4000 m alt., Jan. 1994, <i>Wickenden 36</i> (holotype E!). DIAGNOSIS. Most similar to <i>Bulbophyllum dologlossum</i>, differs by the acute sepals, the 4-veined (versus 1-veined) petals, the ovate-oblong lip, gradually tapering without narrowed parts towards the apex, with only 2 (versus 4) ridges on the adaxial side, and the straight stelidia. Rather small epiphyte with creeping rhizomes and spreading roots. <i>Rhizome</i> ca. 4 mm diam., sections between pseudobulbs arising from the basal node of the pseudobulb; rhizome scales thick, weathering to woolly fibres, persistent. <i>Pseudobulbs</i> distinct, ovoidcylindrical, ca. 2.5 × 0.9 cm, hardly angular. <i>Leaf</i>: petiole ca. 12 mm long; blade thick, obovate-oblong, ca. 6.4 × 0.7 cm, ratio length/width 9.1–9.2; subacute. <i>Inflorescences</i> single or few together, ca. 24 cm long, 1-flowered. Peduncle ca. 17 cm long. <i>Floral bracts</i> 11–12 mm long. <i>Flowers</i>: pedicel plus ovary ca. 4 cm long, basal node ca. 9 mm above the floral bract attachment. <i>Median sepa</i> l free, recurved, ovate, ca. 24.0 × 9.0 mm, ratio length/width 2.6–2.7; acute, margins entire; minutely papillose; 3(–4)-veined. <i>Lateral sepals</i> as the median but triangular, 28.0– 11.5 mm, margins glabrous. <i>Petals</i> porrect, ovate-oblong, ca. 10.0 × 7.0 mm, ratio length/width 1.4–1.5; obtuse, margins slightly erose, ciliolate, surface glabrous; 4-veined. <i>Lip</i> slightly recurved near the base, ovate-oblong, ca. 12.0 × 4.0 mm, ratio length/width ca. 3 (without spreading); obtuse, margins approx. entire, densely hirsute towards the base, glabrous towards the apex; thick; adaxially with two slightly converging ridges, rather close together and with a rather narrow furrow in between, which continue up to ca. 3/5 of the length of the lip, where they grade into the convex lip surface, adaxial surface unevenly papillose-hirsute towards the margins in the basal half of the lip, glabrous elsewhere; abaxially distinctly convex, deeply furrowed and unevenly papillose-hirsute proximally, slightly concave and glabrous distally. <i>Column</i> including stelidia ca. 5 mm long, stigma narrowly obverse-triangular, proximally not protruding from the column face, foot distinctly widened, with patent, obtuse lateral teeth. Stelidia straight, narrowly triangular, ca. 2.6 mm long, acute. <i>Pollinia</i> 4. COLOURS: flowers ‘pale’. ETYMOLOGY: <i>ischuros</i> (Greek) = sturdy, referring to the thick leaf blade. HABITAT AND ECOLOGY: large plant growing in shrub. Elevation 2500–4000 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 pages 304-307, DOI: 10.15517/lank.v20i3.44438, http://zenodo.org/record/4455665