ORCHIDACE^ 



datum vel auriculatum, 3-nervium, 1.5 mm. longum, 1 mm. la- 

 tum. Columna minuta, columnse JD. tenelli similis. 



Philippine Islands: Epiphyte on mountain tops; flowers yellow. At 1800 

 m. alt. on Mt. Pinalubo, Province of Zambales, Luzon, April, 1907, F. W. 

 Foxxvorthy (no. 2542). Specimens in herb. Bureau of Science, Manila, and 

 in herb. Ames. Collector's Note : " The most prominent thing on top of the 

 mountain. It covers the mossy tree trunks very densely. The leaves are a dark 

 rather shiny green.'''' (The mountain is also called Pinalobo and Pinatubo.) 



The column being destitute of stelidia, this species is referred 

 to the section Acoridium. It is clearly distinguished from all other 

 known species of this section by its simple oblong labellum. In 

 habit JD. Foocworthyi resembles D. tenuifolium, from which spe- 

 cies it differs in its flowers. Above, the labellum is described as 

 ecaUose. In the dried condition, at least, no calli are perceptible 

 under the high-power lens of the dissecting microscope. If calli 

 are present they must be extremely minute or evanescent. The 

 graceful racemes are about 5 cm. long, bearing as many as thirty 

 flowers, 2 mm. apart on pedicels 2 mm. long. A wide range of 

 variation is noticeable in the material gathered by Foxworthy 

 on Mt. Pinalubo, some of the specimens being twice as tall as 

 others, but no corresponding variation that I have been able to 

 discover occurs in the flowers of the extremes. 



According to the classification of Dendrochilum species 

 adopted by Pfitzer and Kranzlin in Das Pflanzenreich, D. Fox- 

 worthyi would seem to belong to the subgenus Aphanostelidion, 

 which is in part characterized by the absence of stelidia from the 

 column. It does not seem to me advisable, however, to recognize 

 Aphanostelidion, as it necessitates confusing artificiality in the 

 disposition of the species in the genus.* Had Pfitzer been ac- 

 quainted with the numerous species which have been recently 

 discovered in the Philippine Islands it is probable that he would 



*Cf. Orchidacece, Fasc. ii. pp. vii and viii. 



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