Bulbophyllum cerastes 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 cerastes

description: <i>Bulbophyllum cerastes</i> J.J.Verm., Schuit. &amp; de Vogel, <i>sp. nov.</i> (Fig. 2) TYPE: Indonesia, Papua Province, Vogelkop Peninsula, Ije River, central Tamrau Range, S slope of Mount Kusemum, ascent from Sudjak village, 1100 m alt., 8 Nov. 1961, <i>Van Royen, Sleumer &amp; Schram 7803</i> (holotype L!). Received 23 June 2020; accepted for publication 21 October 2020. First published online: 5 November 2020. Licensed under a Creative Commons Attribution-NonCommercial-No Derivs 3.0 Costa Rica License. DIAGNOSIS. Within section <i>Polymeres</i> uniquely identified by the distinct, retrorse horns formed by the lateral lobes of the lip. It shares this character with <i>Bulbophyllum trutiniferum</i> J.J.Verm., Schuit. &amp; de Vogel, a species intermediate between section <i>Brachypus</i> and section <i>Polymeres</i>, but it differs from that species by the free (versus proximally adherent) sepals and the wide (ratio length/width ca. 1.5, versus 4–5), distally papillose (versus glabrous) petals. Medium-sized epiphyte with creeping rhizomes and spreading roots. <i>Rhizome</i> ca. 5 mm diam., sections between pseudobulbs 0.5–1.0 cm long, arising from the basal node of the pseudobulb; rhizome scales thin, little persistent. <i>Pseudobulbs</i> distinct, ovoid, 1.7–3.5 × 0.7–1.2 cm, hardly angular. <i>Leaf</i>: petiole 16–20 mm long; blade elliptic to obovate, 10.5–16.0 × 2.5–4.1 cm, ratio length/width 3.4–5.2; acuminate. <i>Inflorescences</i> few to many together, 3.5–4.5 cm long, 1-flowered. Peduncle 0.8–1.9 cm long, scales ca. 3. <i>Floral bracts</i> 4.0– 5.2 mm long. <i>Flowers</i>: pedicel plus ovary 1.5–1.6 cm long, basal node ca. 4.2 mm above the floral bract attachment. <i>Median sepal</i> free, recurved, elliptic, ca. 9.0 × 4.0 mm, ratio length/width 2.2–2.3; acute, margins entire; glabrous, 5-veined. <i>Lateral sepals</i> as the median, but elliptic-ovate, ca. 9.8 × 5.8 mm, ratio length/width 1.6–1.7. <i>Petals</i> porrect, obovate, ca. 3.0 × 2.0 mm, ratio length/width ca. 1.5; obtuse, margins approx. entire, papillose distally, adaxial surface papillose distally; 1-veined. <i>Lip</i> recurved approx. halfway its length, 3-lobed, elliptic-obovate in outline with projecting, retrorse, distally slightly downwards falcate, narrowly triangular, obtuse, glabrous, thin lateral lobes attached to the median lobe slightly below half-way its length; median lobe, ca. 2.6 × 1.6 mm, ratio length/ width 1.6–1.7 (without spreading); acute-acuminate, margins entire, ciliate beyond the attachment of the lateral lobes; thick; adaxially approx. flat proximally, distally with two rounded ridges which start close to the margins just in front of the lateral lobe attachment, then converge, meet and continue as a single median ridge to near the apex of the lip, adaxial surface glabrous; abaxially convex and glabrous proximally, slightly convex distally and increasingly hirsute towards the margins. <i>Column</i> including stelidia ca. 2.6 mm long, stigma obovate, proximally with a thickened edge which does not protrude from the lower margins of the column when the latter is viewed laterally, foot slightly widened, with small, patent, obtuse lateral teeth. Stelidia straight, narrowly triangular, ca. 1.1 mm long, acute. <i>Pollinia</i> 4, the inner more than half as long as the outer. COLOURS: flowers white. ETYMOLOGY: <i>kerastes</i> (Greek) = with horns, referring to the lateral lobes of the lip. HABITAT AND ECOLOGY: epiphyte on dead tree in forest. Elevation 1100 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 301-304, DOI: 10.15517/lank.v20i3.44438, http://zenodo.org/record/4455665