ORCHIDACE^ 



Petala circa 4 mm. longa, 3 mm. lata, cuneato-ovata \ el 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 Z>. tenellum Ames. A ery recently 

 George Boettcher visited the type station and secured an abun- 

 dance of specimens that correspond in detail with the tj'pe. A re- 

 examination of the material in my herbarium substantiates the 

 conclusions presented in Orchidaceae 1 (1905) 2, 1. 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. 



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