tundatis; lobo intermedio maximo, transverse reniform], 
antice valde bilobulato, basi subecordato, disco basin callo 
tumido, 3-partito ornato, toto labello usque ad 23 mm. 
longo, 28 mm, lato; columna humili, crassa, clinandrio 
marginato: ovario pedicellato usque ad 25 mm. longo. 
Observation: Oncidium chimborazoénse is larger than O. tunguragu- 
ense, especially in the size of the flowers. It differs from the latter in 
the plants having only one-leaved pseudobulbs and the lip is much 
wider than long. 
There is another specimen at Kew collected also in Chimborazo by 
Cross no. 52! (K), who sent it to the Veitch establishment in 1882. 
Illustration: Bot. Mag. 94: t. 5708, 1868, as O. cucullatum var. 
nubigenum; Belg. Hortic. 19: t. 19, 1869, as O. nubigenum; Dict. Icon. 
Orch. Oneid. t. 30, 1900, as O. nubigenum; Amer. Orch. Soc. Bull. 
41: 1001, 1972, as O. nubigenum. 
Oncidium tunguraguense Stacy, sp. mov. 
Type: Keuador, Vulcan Tunguragua, 8000-8400 m. 
alt. Aug.-Sept. Coll. F.C. Lehmann no. 8572! (Ix). 
Epiphytica, erecta, usque ad 25 cm. alta: radicibus 
flexuosis, glabris; pseudobulbis approximatis, pyriform- 
ibus, lateraliter compressis, bifoliatis, usque ad 4 cm. 
altis; foliis ellipticis vel lanceolato-ellipticis, acutis, usque 
ad 13 cm. longis, 2.5 cm. latis; inflorescentils erectis, 
sursum arcuatis, laxifloris, usque ad 25 cm. longis; flori- 
bus ut videtur secundis; sepalo postico oblanceolato vel 
obovato-oblanceolato, acuto vel obtusiusculo, usque ad 
10 mm. long, 4.5 mm. lato; sepalis lateralibus supra 
basin inter se breviter connatis, lineari-oblongis, acutis 
vel obtusiusculis, 11 mm. longis, 8 mm. latis; petalis 
ellipticis obtusis vel abrupte acutis, usque ad 9 mm. 
longis, 5 mm. latis: labello in ambitu trapezoideo, 3- 
lobo, lobis lateralibus e cuneata basi triangulis, lobo inter- 
medio transverse reniformi, antice retuso vel subbilobulo : 
disco venis incrassatis ornato; callo tumido, 8-partito: 
toto labello usque ad 15 mm. longo, 16mm. lato; colum- 
na humili; clinandrio marginato; ovario pedicellato usque 
ad 2 cm. longo. 
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