446 The Philippine Journal of Science m3 
2.8 to 3 cm across. Sepals oblong-lanceolate, subacute, 1.7 to 
1.9 cm long, 6 to 6.25 cm wide, lateral ones oblique, forming 
a conical obtuse straight spur about 5 mm long. Labellum 3- 
lobed, 1.6 to 1.9 cm long, the base cuneate, decurved about in 
the middle; lateral lobes obliquely triangular-ovate, rounded at 
the apex, the free portion 3 to 4 mm long; middle lobe about 
10 mm long, 14 mm wide, subquadrate-flabelliform, apex retuse; 
carinae 3, the middle line extending from the base of the label¬ 
lum to the apex, the lateral ones prominently elevated and crisped 
in the middle particularly at the isthmus, the keels 1 to 1.5 mm 
high. Column very short. 
Luzon, Manila, Bureau of Science orchid house, Bur. Sci. 
84-713 Eduardo Quisumbing, September 8, 1931. 
The living plants were originally collected by Messrs. Maximo 
Ramos and Pascual Convocar in Dinagat Island, Surigao Prov¬ 
ince, Mindanao, on medium-sized trees near the seashore, in 
June, 1931, but now grow on adobe stone walls in the Bureau 
of Science orchid house. 
Petals, lip, and column white, spotted with violet-carmine. 
Sepals white, suffused with massicot yellow at the base and 
spotted with violet-carmine. Spur massicot yellow and minutely 
dotted with pomegranate purple. 
This form is apparently distinguished from the variable Den- 
drobium plicatile Lindl. by the smaller leaves, pseudobulbs, and 
flowers and by the lack of an elongate base of the lip. This 
variety is dedicated to Mr. Pascual Convocar, a botanical col¬ 
lector of the Bureau of Science, who discovered these plants 
perched on a tree. 
DENDROBIUM IRAYENSE sp. nov. Plate 3, figrs. 5 and 6; Plate 4, figs. 20 to 28; Plate 
9 , fig. 1. 
Caules fasciculati, simplices, 30 ad 95 cm longi, penduli, mul- 
tiarticulati, teretes; internodia 1.5 ad 3 cm longa, fibris va- 
ginarum dejectarum vestita; nodi incrassati. Folia lineari- 
lanceolata, acuminata, acuta, submembranacea, 7.5 ad 9 cm 
longa, 1.4 to 1.6 cm lata; vaginae foliorum subcompressae, apice 
paulum ringentes. Racemi abbreviate laxe 4- ad 8-flori, in 
caulibus defoliatis; bracteae sub anthesi scariosae, lanceolatae, 
acutae, 1.5 ad 2.5 mm longae. Flores purpurei, 1.4 ad 1.8 cm 
lati. Sepala lateralia ovata, acuta, 9 ad 10 mm longa, circiter 
5.5 mm lata, 7-nervia, in mentum subaequilongum, obtusum 
producta. Sepalum dorsale erectum, ovato-lanceolatum, sub- 
acutum, 9 ad 9.5 mm longum, 4.5 ad 5 mm latum, 5-nervium. 
Petala lanceolato-elliptica, acuta, 8.5 ad 9.5 mm longa, 4 ad 
