distantibus, petalis sepalisque quorum lateralia semiconnata acutis reflexis, labello 
maximo subrotundo obsoletè quadrilobo : lobis lateralibus rotundatis, eristá posticè 
tridentatà fornicatà anticè cuneatà varicibus venarum in posticis confluentibus cir- 
cumdatà, alis superioribus columne rotundatis denticulatis inferioribus integerrimis. 
- — Brazil, Prince Maximilian of Wied Neuwied.— A very fine species in the way 
of O. bifolium, but with large spreading compound racemes. 
- O. isopterum ; pseudobulbis ovalibus compressis diphyllis, foliis angustis canaliculatis 
recurvis scapo apice paniculato flexuoso quadrupló brevioribus, sepalis acutis supremo 
fornicato lateralibus semiconnatis divaricatis, petalis obovatis reflexis, labelli laciniis 
lateralibus brevibus angustis obtusis intermedià transversà angulata biloba, cristà 
tuberenlosä, columne alis 4 subzequalibus rotundatis. Brazil, Von Martius. ——A 
small species very near O. flexuosum. 
A. $1. 5. * 
4. O. Martianum ; pseudobulbis, .... foliis . ..., scapo erecto panieulato, sepalo supremo 
petalisque obovatis obtusis concavis lateralibus linearibus acutis brevioribus, labello 
bilobo reniformi : laciniis lateralibus rotundatis nanis, cristá falcatá compressà utrin- 
que tuberculis 3 linearibus ? suffultà, alis column: denticulatis sübquadratis angulis 
rotundatis.——In Brazil, von Martius.——A beautiful yellow species, with a scape 
two feet high; it resembles in general appearance O. ampliatum. 
5. O. lunatum ; pseudobulbis oblongis compressis 1-2-phyllis, foliis angusté oblongis planis 
obtusis scapo brevioribus, scapo racemoso, sepalis petalisque spathulatis retusis, labello 
pubescente lunato basi piloso : laciniis lateralibus minimis inflexis, cristá lineari apice 
depressà utrinque bidentatà : dentibus glanduligeris, alis columns cuneatis integris, 
clinandrio posticè dentato.——A pretty little species, with a white crescent-shaped lip, 
blotched with dull orange, and white sepals blotched with deep orange. Messrs. 
Loddiges imported this plant from Demerara. It will be figured in the Botanical 
Register, folio 1929. 
. O. retusum ; pseudobulbis ...., foliis lineari-lanceolatis, scapo paniculato divaricato, 
sepalis petalisque subzequalibus spathulatis retusis subcarnosis, labelli lobo medio 
reniformi bilobo lateralibus paulò majore, cristá e lamellis 5 brevibus tuberculos 
6 elongatos circumdantibus, columns alis maximis acinaciformibus dentatis. —— 
Peru, Mathews in herb. Hooker.—— A beautiful species with deep chesnut and yel- 
low flowers, and a yellow lip. Its mode of growth is that of O. Baueri. 
7. O. gracile ; pseudobulbis ovatis compressis diphyllis, foliis lanceolatis acutis brevibus, 
scapo gracili apice racemoso 3-6-floro, sepalis lineari-lanceolatis, petalis paulo latio- 
ribus, labello cuneato emarginato basi auriculato lamellis duabus linearibus cristato, 
column alis oblongis integris. Brazil, von Martius.—— The scape of this species 
is about a foot high, with from 3 to 6 rather small flowers at the end. The leaves 
are not more than two inches long, and the pseudobulbs about ird that length. The 
lip is yellow, the remainder of the flower reddish brown and green. 
8. O. ramosum ; pseudobulbis ...., foliis ...., paniculà strictá densà ramosá, sepalis 
angustis acutis supremo erecto fornicato lateralibus unguiculatis angustioribus, pe- 
talis oblongis subundulatis, labello subrotundo bilobo basi auriculato, cristá digitato- 
tuberculatà squamis $ carnosis interjectis, column alis rotundis integerrimis.—— 
Brazil, von Martius.——Seape a foot and half long, much branched, very compact, 
not atall flexuose. Flowers extremely numerous, yellow and olive, rather smaller 
than those of O. altissimum. A beautiful species. 
os 
e 
A. $1. p. ssa 
12. 0. deltoideum ; pseudobulbis angustis angulatis, foliis lanceolatis canaliculatis, scapo 
puniculato ramis multifloris flexuosis divaricato, sepalo supremo unguiculato obovato 
lateralibus longioribus spathulato-lanceolatis, petalis latioribus obovatis crispis, labello 
deltoideo angulis rotundatis, cristà basi tuberculatà apice trilamellatà, column alis 
maximis acinaciformibus dentatis. ——Peru Mathews.—— A remar species, with 
somewhat the habit of a dense-flowered o. altissimum. man - 
