49,4 Ames and Quisumbing: Philippine Orchids, III 489 
of Davao, Divide on Apo Ridge, altitude 3,050 feet. Epiphyte. 
Flowers white. C. M. Weber 2U6, August 25, 1911. 
Luzon, Manila, Bureau of Science orchid house, Bur. Sci. 
8U5U2 Quisumbing, March 11, 1931. The living plants were 
collected from the mountains near the source of Angat Irrigation 
System, Bulacan Province, growing on rocks. The plants 
flowered for the second time earlier (January, 1932). 
A very interesting orchid and worthy of a place in orchid 
gardens. The species doubtless is closely allied to Dendrobium 
papilio Loher, but differs in its unbranched stems, leaves with 
conspicuously auricled bases, and the pure white flowers, purple- 
lined at the bases of petals and sepals, with green throat and 
claw. The margins of the labellum are minutely dentate. The 
plants thrive well in earthen pots with tuff and humus. 
DENDROBIUM GUERREROI sp. nov. Plates 1, 7, 19, and 20. 
Aff. D. O’Brieno et D. amethystoglosso. Caules aggregati, 
elongati, suberecti, basi attenuati, 30 ad 76 cm longi, usque ad 
8 mm in diametro. Folia lanceolata vel oblongo-lanceolata, 7.5 
ad 10.5 cm longa, 1.6 ad 2.5 cm lata, apice attenuata, acuta, mem- 
branacea. Racemi penduli, pauci et laxiflori, usque ad 8 cm 
longi, 10- ad 13-flori, e caulibus defoliatis orientes. Flores 3 ad 
3.3 cm longi, 2 ad 2.2 cm lati. Sepala lateralia oblique oblong-lan- 
ceolata, acuta, 13.5 ad 14 mm longa, 7.5 ad 8.5 mm lata, 7-nervia, 
mentum formantia; mentum elongatum, saccatum, superne 
rectum vel leviter curvatum, obtusum, circiter 1.5 cm longum. 
Sepalum dorsale oblongo-lanceolatum, subacutum, 13 ad 15.5 mm 
longum, 5 ad 6 mm latum, 7-nervium. Petala oblongo-elliptica, 
obtusa, 14 ad 15 mm longa, 6 ad 7 mm lata, 5-nervia. Labellum 
simplex, elongatum, 25 ad 27 mm longum, basi unguiculata 
lineari, in positu naturali complanatum, cum pede gynostemii 
connatum; lamina ovata, 15 ad 17 mm longa, expansa 12 ad 13 
mm lata, margine levissime crenulata vel integerrima, antice late 
rotundata vel leviter retusa, plus minusve apiculata; discus fas¬ 
cia una elevatula carnosa praeditus. Gynostemium brevissimum, 
crassum, tridentatum; stelidia lateralia recurvata, lata, obtusa, 
dens medius tenuis, linearis. Anthera ovoidea, circiter 2 mm 
longa. 
Stems terete, aggregated, elongate, suberect, 30 to 76 cm long, 
U P to 8 mm in diameter at the widest portion, narrowed at the 
base. Leaves distichous, deciduous, lanceolate or oblong-lan¬ 
ceolate, 7.5 to 10.5 cm long, 1.6 to 2.5 cm wide, nervose, mem¬ 
branaceous, greenish, when young flushed with purple, narrowed 
