34 Bulletin Jard. Bot. Bui tenzorg, Série lll, Vol. V. Livr. l. 



c. 0.225 cm. longae, 0.275 cm. latae,infima adpressa, sterilis. Flores patentissimi. 

 Sepalum dorsale lanceolatum, acutum, Inervium, c. 0.47 cm. longum, 0.125 

 cm. latum. Sepala lateralia oblique lanceolata, apicem versus angustata et 

 canaliciilata, acuta, Inervia, dorso carinata, c. 0.43 cm. loiiga, 0.125 cm. lata, 

 Petala oblique lanceolata, sensim acuminata, acuta, 1- sub2nervia, concava, 

 c. 0.4 cm. longa, 0.125 cm. lata. Labellum porrectum, rectum vel curvulum, 

 concavum, Bnervium, basi lata medio tantum affixum, callis 2 brevibus 

 loiigitudiiialibus parallelis lateraliter compressis quadrangulis in hypochylio, 

 explanatum ambitu quiiiquangulari-rhombeum, c. 0.3 cm. longum, hypo- 

 chylio plus minusve contracto, transverse subquadrangulo, c. 0.075 cm. 

 longo, 0.14 cm. lato, lobo intermedio ovato-quinquangulari, acute acuminato, 

 superne apice excepto papilloso, c. 0.225 cm, longo, 0.17 cm. lato. Gynoste- 

 mium brève, dorso convexum, c. 0.1 cm. longum, alis lateralibus e parte 

 inferiore, porrectis, falcatulis, oblique linearibus, acutis, alam apicalem ambitu 

 transverse quadrangulam apice tridentatam (an semper?) bene superan- 

 tibus. Anthera cucullata, transversa, subsemiorbicularis, apice late rotundata 

 et leviter emarginata, c. 0.03 cm. lata, connectivo longitudinali, convexo- 

 incrassato, thecis convexis, lobulis basilâribus majusculis. Pollinia 4, 

 pyriformia. Rostellijm semiellipticum, apice canaliculato recurvum. Stigma 

 suborbiculare, margine elevatum. Ovarium obconicum, fere 0.1 cm. longum ; 

 pedicellus tenuior, 0.1 cm. longus. 



Sumatra: Padangsche Bovenlanden, Laras Talang, Boekit Niroe, 

 1600 m., epiphytical in forest. (H. A. B. BiiNNEMEljER No. 5579, November 

 1918). 



At first sight this differs from the type in the longer and laxer inflore- 

 scences and larger flowers. It is, however, to be noted, that D. aciimi- 

 natiim was described from a cultivated plant, which did not gjow very 

 well in Buitenzorg. 



The bracts of the two plants are very différent; in D. acuminatiini 

 they are manifestly acuminate, in the variety not at ail. 



Only the upper pans of the branches were collected. 



The flowers are said to be light green. 



Description from herbarium material. 



I Dendrochilum (sect. Monochlamys) longicaule J. J. S. n. sp. 



Rhizoma elongatum, dependens, valde ramosum, basi tantum radices 

 crassas emittens, c. 1.15 m. longum, internodiis c. 4.5 — 1.5 cm. longis, 

 vaginis diu persistentibus, dense nervosis, epunctatis. Pseudobulbi ad c. 12 

 cm. distantes, rhizoma continui, sicco tenues, teretes, interne semiteretes 

 et facie rhizoma versus spectante canaliculati, rhizomatis crassitudinem vix 

 aequantes, c. 3.4 — 2.7 cm, longi. Folium petiolatum, lanceolatum, apice 

 longitudine c. 0.75—2 cm. plus minusve contractum, acutum, basi acutum. 



