26 AMES. 
DENDROCHILUM Blume. 
Dendrochilum (§ Acoridium) longibulbum sp. nov. 
Pseudobulbi graciles, fusiformes, elongati. Folia linearia, 
obtusa. Pedunculus gracilis, filiformis, folio longior. Racemus 
4 ad 5 cm longus. Bracteae inflorescentiae distichae. Sepala 
lateralia lanceolata, acuta. Sepalum superius lateralibus simile. 
Petala cuneato-ovata. Labellum crassum, 3-lobatum; lobi latera- 
les semicrescentiformes; lobus medius subquadratus, apiculatus, 
prope basim bicallosus, et callo medio vel mammilla instructus. 
Pseudobulbs densely clustered, elongated, cylindric, rugose, 
2.5 to 4 cm long, 2 to 4 mm in diameter when dry. Leaf shortly 
petioled, linear, obtuse, 7 to 14 cm long, 5 to 7 mm wide, midnerve 
prominent. Peduncle filiform, slightly exceeding the leaf, up 
to 1 dm long. Raceme 4 to 5 cm long, loosely many-flowered 
(fils. about 15), subtended by 2 or 3, glumaceous, scarious, im- 
bricating, empty bracts; flowers white, 2 to 3 mm apart, dis- 
tichous, floral bracts exceeding and concealing the ovary. Lat- 
eral sepals lanceolate, acute, about 3.5 mm long, 1.5 mm wide, 
3-nerved. Upper sepal similar, 3.5 mm long. Petals cuneate- 
ovate, acute, 3 mm long, about 1.5 mm wide, 3-nerved. Labellum 
fleshy, 3-lobed, 1.5 mm long; lateral lobes half crescent form, 
obtuse, shorter than the middle lobe; middle lobe 0.75 mm long, 
subquadrate with a triangular tooth in front. On the disk of 
the lip there are three calli, one in the middle at the bottom of 
the depressed or subsaccate base and one on each side near the 
base of each lateral lobe. Column typical of the section. 
LuzoN, Bontoc Subprovince, Father M. Vanoverbergh 782, altitude 1,550 
m, August 23, 1910. 
Dendrochilum longibulbum might readily be mistaken for a narrow-leaved 
form of D. pumilum, but its smaller flowers and very different petals are 
differentiating characters. 
Of the sixty or more species of this genus which have been described from 
Philippine material all are endemic; I have been unable to discover a single 
exception. Of the described Philippine species I have examined every one 
except D. convallariaeforme Schauer (which is supposed to include D. 
Copelandii Ames) and D. maleolens Krinzl., the latter a recently described 
species which is said to be close to D. oliganthum (Ames) Pfitzer. 
Dendrochilum microchilum (Schlechter) Ames Orchidaceae 2 (1908) 87. 
Platyclinis microchila Schlechter in Bull. Herb. Boiss. II 6 (March, 
1906) 302. 
Acoridium venustulum Ames in Proc. Biol. Soc. Wash. 19 (Sept., 
1906) 147. 
Dendrochilum venustulum (Ames) Pfitzer in Engl. Pflanzenreich 32 
(1907) 116. 
