ONCIDIUM. 65 



On, nigratum. 



Pseudo-bulbs ovoid-oblong, 4 —5 inches long, compressed, ribbed and 



furrowed on the flattened sides, diphyllous. Leaves broadly lanceolate, 



about a foot long. Scapes flexuose, 10 — 15 feet long, loosely branched, 



the branches bearing from five to fifteen flowers. Flowers an inch in 



diameter ; sepals and petals linear-oblong, undulate, reflexed, white with 



2 — 3 black-purple blotches on each ; lip shorter than the other segments, 



pale yellow with a red-brown bar in front of the crest, three-lobed, the 



side lobes rotund with revolute margin, the intermediate lobe oblong, 



apiculate ; crest many toothed, the teeth arranged in four longitudinal 



rows. Column wings narrow, pale yellow. 



Oacidium nigratum, Liadl. in Paxt. Fl. Gard. I. No. 122 (1851). Id. Fol. Orcli. 

 Oncid. No. 105. Rfhb. in Gard. Chron. XIX. (1883), p. 790. 



Discovered by Schomburgk during his exploration of British Guianaj 



1840 — i4, aud sent by him to Messrs. Loddiges, in whose nursery 



it did not flower till some years afterwards^ but was subsequently 



lost. It was re-introduced by us in 1881 through our collector 



David Burke, who found it on the southern slopes of the Roraima 



Mountain at 5^000 — 6^000 feet elevation. Although the flowei-s are 



small they are produced in great profusion on the long rambling 



panicle, and are among the most distinct in the genus; they have 



some resemblance on superficial view to the pretty Odontoglossum 



hlandum. 



On. obryzatum. 



Pseudo-bulbs oval-oblong, much compressed, 2 — 3 inches long, ribbed and 



channelled on the flattened sides, monophyllous. Leaves linear-oblong, 



sub-acute, 6 — 9 inches long. Scapes scandent, 4 — 6 feet long, paniculate, 



the branches short and few flowered. Flowers about an inch across 



vertically ; sepals and petals narrowly spathulate, obtuse, yellow barred 



with red-brown on the basal half. Lip auriculate at the base, the blade 



broadly clawed, transversely oblong, deeply two-lobed, of a jialer yellow 



than the other segmeiits ; crest a triangular median raised plate with two 



teeth in front, one on each side and a cluster of smaller ones beliind. 



Column wings toothed, prolonged and nearly meeting above the anther. 



Oncidium ohrvzatinu, Kchb. in Bonj)!. 1854, p. 198. Id. in Gard. Chron. XII. 

 (1879), p. 456 (dasystalix). Kegel's Gartcnfl. 1878, t. 925. Liudl. Fol. Oroli. Oucid. 

 No. 95. 



Very little has been divulged respecting the origin of this Oncid. 



It is vaguely stated to be a native of Peru, and that it was fii'st 



discovered by Warscewicz about the year 1852. It is not now often 



seen in the orchid collections of this country, but "we have quite 



recently received a fine panicle from Mr. F. W. Moore, of the Royal 



