PROF. OLIVER ON NEW PLANTS FROM RORAIMA. 283 
360. ZYGOPETALUM VENUSTUM, Ridley, n. sp. (Plate XLVII. figs. 1-6.) Planta ceespitosa, 
pseudobulbis nullis. Folia bina, evoluta, lanceolata acuta, basi attenuata, subcoriacea, 
costis tribus elevatis in dorso, 7 ad 8 uncias longa, 2 lata. Scapus lateralis erectus, 
13 uncias longus, vaginis 2—8, apicibus obtusis, amplexis, paullo ampliatis remotis. · 
Racemus laxus, 10-florus. Flores mediocres, unciam longi et lati. Bractes 
pedicellis multo breviores, cylindrice, ovatze, acute, inferiores vaginantes. Pedicelli 
4 unciam longi Sepala ovata, lanceolata, subacuta patula. Petala subsimilia, 
obtusiora et angustiora. Labellum integrum, mentum plicatum, lamina rhomboidea, 
obtusa, lata. Columna brevis crassiuscula, alis magnis obtusis falcatulis, apicibus 
curvis. Anthera subconica. Stigma semilunare. - 
Kookenaam River, 3000 ft. 
There is a figure of what seems to be the same species in the drawings made by 
Schomburgk, preserved in the British Museum. It was obtained at Takootoo, and is 
represented as having white flowers, with the base of the lip and the mentum yellow and 
a few faint purple stains towards the apex of the lip, and purple streaks on the face of 
the column. The fruit is дейехед, oblong in shape. In the absence of a distinct pseudo- 
bulb, this plant differs from the rest of the genus, but the flowers are exactly those of 
Zygopetalum. 
114. Охстотом NiGRATUM, Lindl. 5400 ft. (our house). , 
12. ONcIDIUM ORTHOSTATES, Ridley, n. sp. (Plurituberculata Hom:eantha expansa.) 
. Pseudobulbus oblongus, 2 uncias longus. Folium lanceolatum oblongum, 3 uncias 
longum, 1 unciam latum.  Scapus elatus validulus rigidus ultra bipedalis. Bracteze 
lanceolatz deflexze breves -unciales. Flores mediocres, iis О. сові sequantes. Pedicelli 
lunciam longi. Sepala lanceolata subacuta. Petala subsimilia viridia brunneo macu- 
lata (ex sicco). Labelli lobi laterales spathulati obtusi, medius basi angustatus rotun- 
datus reniformis emarginatus, cuspide minuto.  Callus, carina lamellas duas breves 
gerens. Columna brevis stelidiis obtusis magnis dolabriformibus tenuibus. Pedicellus 
polliniorum elongatus ligulatus, diseus oblongus quadratus, margine exteriore eroso. 
Treng River; also 23, Savannah, W. H. Campbell in Herb. Kew. 
19. SOBRALIA STENOPHYLLA, Lindl. Spelinioola, Arapoo River. 
273. SOBRALIA (inadequate). Upper slope, Roraima. 
115. POGONIA PARVIFLORA, Reichb. f. 5400 ft. (our house). 
342. SPIRANTHES BIFIDA, hidley, n. sp. Tubera elongata clavata. Folia ovata petiolata 
acuta tenuia parva, lamina semiunciam longa, з unciam lata, petiolus vix semi- 
uncialis. Caulis debilis parce pubescens, ferme 10-uncialis; vaginis circiter 9, laxis 
lanceolatis acuminatis dissitis 3 unciam longis. Racemus densus spiralis, unciam 
longus. Bracteæ flores superantes, lanceolate acuminatz. Sepala, petala et labellum 
subsimilia, lanceolata angusta obtusa, marginibus involutis, apicibus bifidis, minute 
202 
