Bulbophyllum trivenosum 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 trivenosum

description: <i>Bulbophyllum trivenosum</i> J.J.Verm., Schuit. &amp; de Vogel, <i>sp. nov.</i> (Fig. 11) TYPE: Papua New Guinea, East Sepik Province, Hunstein Range, 1500 m alt., 5 Oct. 1989, <i>LAE (Katik &amp; Kairo) 64395</i> (holotype L!; isotypes LAE, NSW). DIAGNOSIS. Most similar to <i>Bulbophyllum ischnopus</i> Schltr. and <i>B. melinanthum</i> Schltr., differs from both by its 3-veined petals; in addition, it differs from the first by the shorter and thicker papillae on the abaxial surface of its lip, from the second by its oblong (versus ovate) petals. Small epiphyte with creeping rhizomes and spreading roots. <i>Rhizome</i> 0.8—1.0 mm diam., sections between pseudobulbs 1.0–4.0 cm long, arising from the basal node of the pseudobulb; rhizome scales thin, little persistent. <i>Pseudobulbs</i> distinct, ovoid, 9.5–11 × 1.5–2.0 mm, (?)angular. <i>Leaf</i>: petiole 1.3–2.0 mm long; blade elliptic-oblong, 1.0–1.7 × 0.2–0.4 cm, ratio length/width 3.8—8.5; obtuse. <i>Inflorescences</i> single or a few together, ca. 3.5 cm long, 1-flowered. Peduncle ca. 1.9 cm long, scales ca. 2. Floral bracts ca. 2 mm long. <i>Flowers</i>: pedicel plus ovary ca. 9.5 mm long, basal node ca. 1.2 mm above the floral bract attachment. <i>Median sepal</i> free, recurved, elliptic, ca. 4.5 × 1.8 mm, ratio length/width ca. 2.5; acute-acuminate, margins entire, minutely papillose; glabrous, 3-veined. <i>Lateral sepals</i> as the median, but triangular, ca. 4.4 × 2.0 mm, ratio length/width 2.1, acute, margins glabrous. <i>Petals</i> porrect, oblong, ca. 2.1 × 1.0 mm, ratio length/width ca. 2.1; rounded, margins entire, minutely papillose, surface glabrous; 3-veined. <i>Lip</i> slightly curved, ovateoblong, slightly attenuated at ca. 1/3 of its length, ca. 2.8 × 0.8 mm, ratio length/width ca. 3.5 (without spreading); obtuse, margins entire, papillose at ca. 1/3 of its length, otherwise glabrous; thick; adaxially concave proximally, slightly concave distally, surface glabrous; abaxially with hardly a median furrow, convex, papillose but glabrous near base and apex. <i>Column</i> including stelidia ca. 1.7 mm long, stigma narrowly elliptic with the proximal edge slightly protruding, foot widened, with slight, patent, obtuse lateral teeth. Stelidia slightly downwards falcate, narrowly triangular, subulate distally, ca. 1.0 mm long, acute. <i>Pollinia</i> not seen.. COLOURS: flowers yellow and purple (?, label unclear). ETYMOLOGY: <i>tres</i> (Latin) = three, <i>venosus</i> (Latin) veined. HABITAT AND ECOLOGY: epiphyte in rainforest ca. 2 m above the ground. Elevation 1500 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 317, DOI: 10.15517/lank.v20i3.44438, http://zenodo.org/record/4455665