S4 B ulletin Jar d. Bot. Buitenz qrg, Série 111, Vol. V. Livr. i. 



In the type spécimens the leaves are wantino-. 1 can novv give a 

 description of thèse organs. 



The species proves to be rather common in the higher mountainregioiis 

 of the Padangsche Bovenlanden. It is very variable in the form of the lip, 

 vvhich shows différent stages from distinctly three lobed to ahnost entire. 



„Flowers white to violet, with a yellow blotch on the lip." (BùNNEMEljER). 



O var. oblongum J. J. S. n. Sp. 



Mentum cum ovario angulum acutum faciens, a latere visum oblongum, 

 supra basin incurvulum, leviter a latere compressum, obtusum. Labellum 

 spathulatum, vix 31obulum. Pes gynostemii apice incurvus cum excavatione. 



Sumatra: Padangsche Bovenlanden, Goenoeng Malintang, 1300— 

 1400 m , in forest. (H A. B. BiiNNEMElJER nrs. 4046 and 4209, July- 

 August 1Q18). Laras Talang, Boekit Gombak, 1600—2000 m., in forest, 

 common. (H. A. B. BiiNNEMElJER nrs. 5454 and. 5710, November 1918). 



The variety differs in the form of the mentum, which is not conic but 

 oblong and somewhat compressed laterâlly. 

 The flowers are violet. 



5 Dendrobium (sect. Calcarifera) ventrilabium J. J. S. n. sp. 



Inflorescentiae brevissimae, 2 — Sflorae, pedunculo tenui, 



c. 0.65 cm. longo, nonnullis vaginulis donato, rachide quaquaverse flexuosa, 

 tenui, c. 0.65 cm. longa. Bracteae adpressae, parvae, triangulae, c. 0.23 cm, 

 longae. Flores médiocres, c. 3.6 cm. longi. Sepalum dorsale cum ovario 

 angulum rectum faciens, ovatum, apice angustatum, obtusum, vix apiculatum, 

 subplanum, 7nervium, c. 1.43 cm. longum, 0.8 cm. latum. Sepela lateralia 

 lacinia longa oblique oblonga concava ad pedem gynostemii decurrentia, 

 men4um conspicuum marginibus anticis longitudine c. 0.25 cm. connatis 

 calcariforme cum ovario angulum rectum faciens incurvum leviter a latere 

 compressum dorso apicem versus obtuse carinatum obtusum fere 2 cm. 

 longum formantia, parte antica patentia, oblique triangula, apice angustata, 

 acutiuscula cum apiculo conico, subplana, Tnervia, c. 1.4 cm., usque 

 apicem menti 2.65 cm. longa, basi 1.95 cm. lata. Petala patentia, oblique 

 elliptica, brevissime apiculato-acuminata, superne repandula, concava, 5nervia, 

 c. 1.37 cm. longa, 0.7—0.75 cm. lata. Labellum erectum, pedi gynostemii i 

 et gynostemio parallelum, inexplanatum c. 2.75 cm. longum, ungue lineari, 

 basi longitudine c. 0.7 cm. pedi gynostemii adnato, deinde rectangule patente 

 et pedem versus incurvo, 5nervio, appendice longitudinali late lineari canali- 

 culata acute marginata antice supra basin laminae in dentem liberum triangulum 

 basi in lobulum similem truncatum pedi gynostemii adpressum producta in 

 unguis parte superiore, explanato c. 1.5 cm. longo, medio 0.37 cm. lato, j 

 lamina erecta, margine apicali angusto recurva convexa et inferius longi- ™ 

 tudinaliter 5sulcata, infra apicem valde veiitricoso-concava, gynostemium - 



