P. oblanceolata P. minutalis 
Lip about six times longer than Lip about three times longer than 
broad, biauriculate at the base. broad, not auriculate at the base. 
Petals abruptly acuminate, en- Petals not acuminate, serrulate. 
tire or minutely serrulate. 
In addition there seem to be some differences in the 
column; the leaves of P. oblanceolata are comparatively 
long and narrow. 
Pleurothallis Oestlundiana L. O. Williams sp. 
nov. 
Herbae caespitosae, epiphyticae, usque ad 13 cm. al- 
tae. Caules secundarii graciles. Folia oblanceolata, ob- 
tusa, coriacea, caulibus subaequalia. Pedunculi uni vel 
plures, quam folia breviores. Sepalum dorsale anguste 
oblongo-spathulatum, obtusum, trinervium. Sepala lat- 
eralia usque ad supra medium connata, uninervia, apice 
integra vel obscure dentata. Labellum lanceolato-obova- 
tum, carnosum. Columna generis. 
Caespitose, epiphytic herbs, up to 18 cm. tall. Sec- 
ondary stems slender, 2.5—5 cm. long, covered with one 
or two scarious brown sheaths which are puberulent on 
the angles. Leaves 3-7 cm. long, 0.6—1.4 cm. broad, 
oblanceolate, obtuse, coriaceous, usually tapered gradu- 
ally into a short petiole, about as long as or a little longer 
or shorter than the secondary stems. Peduncles one or 
several from the base of the subtending leaves, shorter 
than the leaf. Dorsal sepal 5-7 mm. long, 2-8 mm. 
broad, narrowly oblong-spatulate, obtuse, 8-nerved. Lat- 
eral sepals joined for about three quarters of their length, 
about 5.5 mm. long, the pair 3.5 mm. broad, oblong, 
acute, gibbous at the base, each sepal 3-nerved. Petals 
about 2.5 mm. long and 1.7 mm. broad, broadly clavate, 
1-nerved, the apex entire or obscurely dentate. Lip about 
4.5 mm. long and 2 mm. broad toward the tip, lanceolate- 
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