Bulbophyllum orthoraphe 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 orthoraphe

description: <i>Bulbophyllum orthoraphe</i> J.J.Verm., Schuit. &amp; de Vogel, <i>sp. nov.</i> (Fig. 6) TYPE: Papua New Guinea, Enga Province, Kandep Range, Mt. Leyan near Laiagam, ca. 3000 m alt., <i>Jongejan cult. 765</i> (holotype L!, spirit material). DIAGNOSIS. Shares the clustered growth, combined with a distally not attenuated lip without sharply outlined patches of papillae or hairs with <i>Bulbophyllum dischorense</i> Schltr. and <i>B. muriceum</i> Schltr., from which it differs by the oblong (versus triangular) petals and by the straight (versus sigmoid) stelidia; with <i>B. meliphagirostrum</i> Van Royen, from which it differs by the wider lip (ratio length/width 2.2–3.4, without spreading, versus 5–8) and by the shorter petals (2.2– 3.2 mm long versus 4–5 mm long). Small epiphyte with creeping rhizomes and spreading roots. <i>Rhizome</i> 1.0–2.0 mm diam., sections between pseudobulbs 0.1–0.5 cm long, arising from the basal node of the pseudobulb; rhizome scales thin, little persistent. <i>Pseudobulbs</i> distinct, ellipsoid to ovoid, 0.6–1.2 × 0.1–0.5 cm, hardly angular. <i>Leaf</i>: petiole 0.1–0.3 mm long; blade elliptic to obovate, 1.2–2.5 × 0.4–0.6 cm, ratio length/width 2.6–6.4; subacute. <i>Inflorescences</i> single or a few together, 4.9– 6.3 cm long, 1-flowered. Peduncle 3.0–4 0 cm long, scales 3–4. <i>Floral bracts</i> 2.5–5.0 mm long. <i>Flowers</i>: pedicel plus ovary 7–10 mm long, basal node 1.5–2.0 mm above the floral bract attachment. <i>Median sepal</i> free, recurved, (ovate-)triangular, 9.5–13.0 × 1.5–2.5 mm, ratio length/width 4.8–6.4; acute(-acuminate), margins entire, ciliolate, surface glabrous; 3-veined. <i>Lateral sepals</i> as the median but triangular, 12.0–15.0 × 1.8–2.7 mm, ratio length/width 4.8–6.7, upper margin glabrous. <i>Petals</i> porrect, oblong to (ob-)ovate, 2.2–3.2 × 0.8–1.4 mm, ratio length/width 2.0–3.0; obtuse to acute-acuminate, margins entire, ciliolate, surface glabrous; 1–2-veined. <i>Lip</i> approx. porrect, ovate, 3.7– 4.3 × 1.1–1.9 mm, ratio length/width 2.2–3.4 (without spreading); rounded, margins entire, approx. glabrous to finely papillose in the basal half (but glabrous close to the base); thick and soft; adaxially concave in the proximal 2/5–1/2, increasingly convex distally, adaxial surface with two vaguely outlined (minutely) papillose patches towards the margins in the basal half, otherwise glabrous; abaxially with a median furrow along its entire length, otherwise convex, surface minutely papillose proximally. <i>Column</i> including stelidia 1.5–1.6 mm long, stigma wide-obovate, proximally not protruding from the column face, foot distally widened, with spreading, rounded lateral teeth. Stelidia porrect, narrowly triangular, 0.4–0.6 mm long, acute. <i>Pollinia</i> 4, the inner more than half as long as the outer. COLOURS: flowers red-purple. ETYMOLOGY: <i>orthos</i> (Greek) = straight, <i>raphe</i> (Greek) = needle, referring to the straight stelidia. HABITAT AND ECOLOGY: epiphyte in moss forest. Elevation ca. 3000 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 309, DOI: 10.15517/lank.v20i3.44438, http://zenodo.org/record/4455665