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Mentawei-lslands. (J. F. K. Hansen, cuit, in his ^arden in Buitenzorg). 



This species differs from R. spathukita (Bl.)J.J.S. by the coloiir of 

 the flowers and the faiiitly curved spiir uot broadened at the apex and 

 bearing a transverse callus in the middle. 



Description from a living spécimen. 



R G b i q u e 1 1 a v i r i d i r o s e a J. J. S. n. sp. 



Caulis dependens, apice incutviis, flcxuosus, sectione transversa ellip- 

 ticus, atroviolaceus, c. 16 cm. longus, 0.5 cm. latus, internodiis c. 1.1 — 1 3 

 cm. longis, radicibus ad nodos solitariis, vaginam basi oblique perforantibus. 

 Folia patentia, basi semitora, oblique lanceolata, apice brevjter contracta 

 et breviter inaequaliter obtuse bilobula erosulaque, basi brevissime con- 

 duplicata, costa média supra sulcata subtus basin versus carinata, carnoso- 

 coriacea, viridia, novella nitidula, adulata opaca, c.7 — 125 cm. longa, 1.7 - 2.5 

 cm. lata; vaginae tubulosae, iiiternodia aequaiites vel paulum superantes, 

 antice et postice carinatae, dilute virides, dense conflueuter sordide viola- 

 ceo-maculatae, c. 0.7—0.85 cm. latae. Inflorescentiae vaginam dorso ad 

 basin perforantes, patentes, deorsum spectantes, folia superantes, rectae, 

 densius multifiorae, pedunculo teieti, dilute viridi, dense conflueuter sordide 

 atrovioiacee striato-maculato, c. 9,5 cm. longo, 0.175—0.25 cm. diam , 

 vaginulis c 3 brevibus tubulosis donato, rachide angulata, costata, lateri- 

 bus concava, colore pedunculi, c. 5—7 cm. longa. Bracteae e basi triangula 

 subulatae, c. 0.25 cm. longae. Flores quaquaversi, patentissimi vel leviter 

 reversi, c. 1.35 cm. longi, sepalis petaiisque inferne albis, dimidio superiore 

 fere viridibus. Sepalum aorsale obloiigo-subobovatum, obtusum, basin 

 versus angustatum, concavum, basi intus leviter incrassatum, dorso inferne 

 fascia longitudinali incrassata, c. 0.6 cm. longum. 0.3 cm. latum. Sepala 

 lateralia porrecta, a sepalo intermedio remote inserta, oblique subelliptica, 

 obtusa, apiculata, basi subcontracta, concava, dorso fascia longitudinali 

 manifeste conve^o-incrassata, c. 0.55 cm. longa, 3 cm. lata. Petalacumla- 

 bello conniventia, oblique elliptica, obtusa, c. 0.575 cm. longa, bene 0.3 

 cm. lata. Labellum calcaratum, subtrilobum, usque ad apicem ovarii bene 

 0.4 cm., cum calcari 1 cm. longum; lobi latérales erecti, brevissimi, lati, 

 obtusanguli, subrotundati. antice non producti, sinu latissimo a lobo inter- 

 medio separati, intus linea incrassata margini parallela postice in calcar 

 decurrente, lineis antice ante basin lobi intermedii in callum transversum 

 antice convexum viridem confluentibus, albi, margine antico virides et parce 

 purpureo-maculati; lobus intermedius porrectus, crasse carnosus, supra visus 

 triangulus, apice lateraliter compresso-truncatus, obtusus, basi concavus, 

 dorso convexus cum sulco longitudinali, nitide atroviridis, bene 0.1 cm. 

 longus, 0.125 cm. latus; calcar conspicuum, elongatum, reversum, ovario 

 fere parallelum, supra médium valde incurvum, parte inferiore oblique infundi- 

 buliformi et subcylindrica, ante médium vix constrictum, ultra constrictionem 

 teres, apice lateraliter compressum, obtusum, pallide purpureum, inexpla- 

 natum c. 0.7 cm. longum. Gynostemium parvum, malleiforme album, dilute 



