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Record: oai:ARNO:525868

AuthorJ.J. Vermeulen
TitleA new species of Bulbophyllum (Orchidaceae) from East Africa
JournalBlumea - Biodiversity, Evolution and Biogeography of Plants
AbstractPlant creeping, epiphytic. Roots 0.5—0.8 mm diam. Rhizome 0.8—1.2 mm diam., nodes not or hardly swollen; rhizome scales tubular, tip acute or subacute, the upper ones obtuse; membranous with some well-spaced nerves; keeled below towards the tip. Pseudobulbs 2-leaved, ovoid or narrowly ovoid, 2-9 cm apart, 1.2-3.5 x 0.3- 1.3 cm, more or less flattened, strongly 4-angled. Petiole 1—2 mm long. Leafblade oblong to lanceolate, 1.7-5.5 x 0.4-1.3 cm; tip rounded to obtuse, usually finely emarginate, either or not oblique; coriaceous, thick; midrib somewhat prominent abaxially. Inflorescence 3.5-11 cm long, 4-18-flowered. Peduncle wiry, more or less erect, 1.2—3.6 cm x 0.4—0.5 mm, about orbicular in section, glabrous, with 5—6 scales. Scales tubular, up to 3-4 mm long; tip acuminate, the upper ones acute; membranous, nerves inconspicuous; keeled abaxially towards the tip; glabrous. Rachis somewhat arching or nodding, terete, straight or very slightly zig-zag bent, 2.3—7.4 cm long, glabrous. Floral bracts recurved, deltoid to ovate, 3.2—4.5 x 3—3.2 mm; tip acute; base broadly attached; membranous; keeled abaxially; glabrous. Flowers distichous, recurved, many or nearly all open simultaneously, not fully opening. Pedicel and ovary 2—3 mm long, glabrous. Median sepal about straight, narrowly elliptic to oblong, 5.2—6 x 2—3 mm; tip obtuse, subacute or very slightly apiculate; margins entire, very finely papillose, especially in the upper half; base broadly attached; rather thin; very finely papillose towards the margins adaxially, especially in the upper half; not keeled and about glabrous abaxially. Lateral sepals free, straight to somewhat recurved, obliquely oblong to ovate oblong, 5—5.5 x 2-2.6 mm, tip acute; otherwise as the median sepal. Petals straight, obovate-oblong to obovate-lanceolate, 2-2.8 x 0.8-0.9 mm, tip subacute, obtuse or slightly emarginate; margins entire and glabrous near the base, towards the tip slightly irregular and very finely papillose; base broadly attached; thin; not keeled abaxially; glabrous. Lip recurved just above the base, in natural position oblong to broadly lanceolate, 3.6—4 x 1.2—1.8 mm, tip obtuse, rounded or slightly retuse; margins entire, coarsely papillose near the base, finer papillose towards the tip; thick; adaxially with a weakly to moderately developed, rounded ridge in the basal half at each side of the median line, with a hardly or very weakly concave part very near to the base; surface rather coarsely papillose except for a narrow median strip which is glabrous; abaxially with a very low, retuse ridge in the lower half, glabrous or nearly so. Column 2.3—3 mm long, with more or less falcate, triangular, caudate stelidia of 1.2—1.6 mm long, which have a distinct, deltoid, obtuse or subacute tooth along their adaxial margin, just above their base, and occasionally a small, more or less deltoid, acute, forward directed tooth along their abaxial margin; stigma with a slightly protruding base but without a basal tooth. Anther c. 0.6 x 0.5 mm, front margin not drawn out, about truncate, thin, slightly irregular, glabrous; basally deeply emarginate; abaxially with a strongly developed, conical, obtuse, more or less papillose thickening near the top which strongly overtops the front margin, surface somewhat papillose. Pollinia 4; ovoid; the small ones strongly flattened on either side, more than half as long as the large ones which are flattened on one side. Fruit not seen.
Colours. Pseudobulbs often reddish. Sepals and petals pale green, tinged with maroon/mauve or entirely maroon/mauve. Lip yellow.
Document typearticle
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