82 Bulletin Jard. Bot. Buitenzorg, Série III, Vol. V. Livr. l, 



The plant cultivated in the Buitenzorg Gardens is a form with a some- 

 what longer midlobe of the lip. 



Description from a cultivated plant, 



Dendrobium (sect. Distichophyllum) orbiculare JJ-S. in Bull. Jard. 

 Bot. Buit. 2e sér. XIII (1914), 13. — D. fiisco-pilosiim A. et S.! in AMES 

 Orch. VI (1Q20), 101. 



The plant described by AMES and SCHWEINFURTH does not differ in 

 any respect from D. orbiculare, only the flowers of the type appear to be 

 a little snialler. Since the plant has been collected also in Banka. 



Dendrobium (sect. Distichophyllum) siberutensc J-J-S. n. sp. 



Rhizoma repens, elongatum, ramosum, vaginatum, e nodis radicem 

 crassam emittens. Gaules c. 13.5 cm. distan.tes, rhizoma continui, simplices, 

 c. 27 — 34 cm. longi, basi vaginati, ceterum foliati, internodiis inferioribus 

 c. 3.5 cm. longis,. superioribus ad c. 0.6 cm. reductis. Folia patentia, auguste 

 lanceolata, apicem versus angustata, inaequaliter acute bidentata, sicco 

 papyracea glaucescentia et dorso minute nigro-puncticulata, ad c. 7.75—8.5 

 cm. longa, O.Q— 1.1 cm. lata, superiora decrescentia ; vaginae tubulosae, 

 internodia superantes, apice antice rotundato-excisae, truncatae, antice 

 densius ceterum parce subadpresse grossius nigro-hirtae. Inflorescentiae e 

 nodis, vaginas 2 perforantes, erecto-patentes, brèves, 4--5florae, pedunculo 

 c. 0.5—0.6 cm. longo, nonnullis vaginulis brevibus tubulosis donato, rachide 

 flexuosa, c. 0.6—1 cm. longa. Bracteae persistentes, oblongo-triangulae, 

 acutae, concavae, ad c. 0.45 cm. longae. Flores médiocres. Sepalum dor- 

 sale oblongum, apice angustatum, obtusum, longius recurvule apiculatum, 

 infra médium vix constrictum, 5nervium, fere 1.1 cm longum, 0.475 cm. 

 latum. Sepala lateralia lacinia oblique linereari ad pedem gynostemii decur- 

 rentia, margine antico breviter connata, mentum reversum auguste conicum 

 obtusum c. 0.775 cm. longum formantia, oblique auguste oblonga, longe 

 subulato-apiculata, 5nervia, c. 1.3 cm., usque apicem pedis gynostemii 

 fere 2 cm. longa, 0.4 cm. lata. Petala oblique lineari-spathulata, vix falcatula, 

 2/3 partibus superioribus erosa, obtusa, abrupte acute triangulo-apiculata, 

 3nervia, nervis exterioribus brevissimis, c. 1,15 cm. longa, inferne 0.16 cm., 

 superne 0.23 cm. lata. Labellum ungue 73 partibus pedis gynostemii ad- 

 natum, concavum, 31obum, carnosulum, 3costatum, costis exterioribus infra 

 basin lobi intermedii terminantibus dimidio inferiore in verrucas solutis 

 ceterum glabris, costa intermedia brevi glabra infra basin lobi intermedii 

 abrupte terminante in medio labelli, 5nervium, nervo intermedio in unguem 

 decurrente, sequeiitibus e basi laminae ortis, explanatum totum c. 2.2 cm. 

 longum, ungue lineari, c. 0.475 cm. longo, 0.18 cm lato, mesochylio oblongo- 

 sublyriformi, basi late obtuso, medio inconspicue constricto, apice in lobos 

 latérales triangulos obtusos paucidenticulatos antice truncatos leviter dilatato, 



