Observation: The large lateral lobes of the lip and the cuneate- 
flabellate midlobe readily identify the plants belonging to this new 
species. It appears to be rather common in the Azuay region. 
The following additional specimens belong here; Ecuador: Azuay- 
Tarqui. Coll. Harling & Andersson no. 18205 bis! (AMES, S); Cuena, 
Coll. Strobel s.n./ (AMES); without exact locality. Coll. Rodrigo 
Escobar-R. no. 1380! (AMES). 
Illustrations: Amer. Orch. Soc. Bull. 32: 905, 1963, as O. nubi- 
genum., 
Oncidium tarquiense Stacy, sp. nov. 
Type: Ecuador, Province Azuay, Portete del Tarqui, 
Cuenca-Girén, 2700-2950 m. altitude. Coll. Harling & 
Andersson no. 18205! (S). 
Epiphytica erecta, usque ad 30 cm. alta; radicibus 
flexuosis, glabris, pseudobulbis ascendentibus ovoideis 
vel pyriformibus, 2-foliatis, basi vaginis chartaceis ob- 
tectis, usque ad 5 cm. longis, 1.5 cm. latis: foliis satis 
tenuibus, lineari-oblanceolatis, obtusis, usque ad 10 cm. 
longis, 1.5 cm. latis: inflorescentiis gracilibus, paululo 
arcuatis, laxe secundifloris: racemo laxifloro: bracteis 
infundibuliformibus, oblique ovato-triangularibus, 5mm. 
longis; sepalo postico elliptico, obtuso vel subacuto, 16 
mm. longo, 6 mm. lato; sepalis lateralibus quarta parte 
basali inter se connatis, supra liberis, anguste ellipticis, 
acutis, 17 mm. longis, 5 mm. latis; petalis late ellipti- 
cis, acutiusculis, 14 mm. longis, 8 mm. latis; labello 
3-lobo, lobis lateralibus oblique ovatis, lobo intermedio 
maximo, cuneato-flabellato, antice bilobulato, lobulis 
rotundatis; disco basin callo minuto, subquadrato, sur- 
sum curvato ornato; toto labello 24 mm. longo, 28 mm. 
lato; columna humili; clinandrio marginato; ovario 
pedicellato usque ad 85 mm. long. 
Observation: The flowers in general appearance are larger than 
those found in O. a/ticola. The transversely rectangular-oblong callus 
which is distinetly curved upwards is unique in the whole alliance, 
hence affords an excellent field character for identification. 
[ 160 } 
