ONCIDIUM. 35 



was observed when the species was first introduced, one form 

 being wholly brown or coppery red, but which is now rarely 

 seen. 



On. euxanthinum. 



" Pseudo-bulbs ellipsoid, flattened, 2 — 3 inches long, diphyllous. 

 Leaves linear-ensiform, acute, 8 — 10 inches long. Scapes slender, 

 drooping, with a broad, many-flowered panicle longer than the leaves. 

 Flowers about an inch in diameter, bright golden yellow with some 

 red dots on the disk of the lip and bars across the sepals and petals; 

 dorsal sepal obovate, obtuse, arching over the column ; lateral sepals 

 united into an obovate bifid body with acute lobes ; petals longer than 

 the sepals, oblong undulate ; lip shortly clawed, three-lobed, the lateral 

 lobes orbicular, the mid-lobe reniform, much broader than long, with 

 an acute sinus in the anterior margin ; crest with several warts in a 

 transverse line and a prominent conical horn and other smaller warts." 

 — Botanical Magazine. 



Oncidium euxanthinum, Rclib. in Gard. Chron. 1869, p. 1158. Bot. Mag. t. 6322. 



A very pretty Oncid, allied to Oncidium hifoliiim, but distinguished 

 fi'om that species by its larger pseudo-bulbs, broader leaves, panicled 

 inflorescence, and especially by the very different crest of the 

 labellum. It was imported by us from Brazil in 1869, the locality 

 not being communicated by the collector ; the plate in the Botanical 

 Magazine was drawn from a plant that flowered in our houses in 

 the autumn of 1871. It appears to be now lost to cultivation, 

 but its dwai-f habit and bright coloured flowers should cause it to be 

 sought for by collectors. 



On. excavatum. 



Pseudo-bulbs ovate-oblong, compressed, 3 — 5 inches long, monophyllous. 

 Leaves linear-ligulate, 12 — 20 inches long. Scapes stoutish, glaucescent, 

 2 — 3 feet long, paniculate, many flowered. Flowers 1^ inches in 

 diameter; sepals undulated, yellow with 2 — 3 red-brown bars on the 

 basal half, the dorsal one obovate-oblong, the lateral two narrower and 

 free, oval-oblong; petals also undulated, larger than the sepals, obovate- 

 oblong, emarginate, sometimes wholly yellow, sometimes with 1 — 2 led- 

 brown spots near the base ; lip three-lobed, the basal lobes small, 

 oblong, convex, red-brown, the front lobe transversely oblong, emarginate, 

 bright canary-yellow ; crest convex, studded with small tubercles arranged 

 in five lines, and with a decurrent shallow plate on each side. Column 

 wings roundish, retuse. 



Oncidium excavatum, Lindl. Sert. Oich. sub. t. 25 (1838). Id. Bot. Keg. 1839, 



misc. No. 150. Id. Paxt. Fl. Gard. I. sub. t. 21. Id. Fol. Orch. Oncid, No. 85. 



Bot. Mag. 1. 5293. On. aurosum, Kclib. in. Boupl. I. 1854 (May). Illus. hort. 1870, 



t. 34, Lmdenia, V. t. 221. 



