ORCHIDACEAE 
Petala circa 4 mm. longa, 3 mm. lata, cuneato-ovata vel sagit- 
tata, variabilia, acuminata, acuta, trinervia. Labellum simplex, 
integrum, valde carnosum, 2 mm. longum, 1 mm. latum, trul- 
liforme, obtusum, sessile, subcordatum, prope basim in foveam 
excavatum, ecallosum. Gynostemium breve. 
In general aspect this species resembles Dendrochilum philip- 
pinense Pfitz., but is distinguishable from it by the simple trowel- 
shaped labellum. When immature the pseudobulbs are concealed 
by tubular bracts the lowermost of which are much reduced. The 
uppermost bract conceals the petiole of the leaf and the base 
of the peduncle. As the plants mature these bracts gradually 
disintegrate and are finally represented only by fibrous remains. 
Luzon, Apayo Province, Mount Pasoan, George Boettcher, January 1, 
1918. 2000 meters altitude. Flowers purple. 
Dendrochilum (§ Acoridium) sphacelatum (Ames) Pfitz. 
in Engl. Pflanzenreich IV, 50. II. B. 7 (1907) 112. 
The absence of this species from the wealth of material re- 
ceived from the Philippines since 1905 had led me to believe 
that it represented, perhaps, an aberrant form of the more com- 
mon and widely distributed D. tenellum Ames. Very recently 
George Boettcher visited the type station and secured an abun- 
dance of specimens that correspond in detail with the type. A re- 
examination of the material in my herbarium substantiates the 
conclusions presented in Orchidaceae 1 (1905) 2, t. 1. D. sphace- 
latum in its distribution confirms my belief that those species of 
Dendrochilum that are alpestrine in their requirements are very 
often confined to particular mountains or mountain ranges. This 
is a subject on which the attention of collectors should be con- 
centrated. 
Luzon, Benguet Province, Mount Santo Tomas, George Boettcher, May 
1918. 
