Dendrochilum. 87 



semiteres, labello aequilongum vel brevius, ala apicali conspicue late membranacea 

 plana vel cucullata ornatum; stelidia 2 e basi, media parte vel apice gynostemii orien- 

 tia, satis conspicua raro obsoleta. Anthera dependens vel horizontalis, rostello incum- 

 bens, subglobosa vel late ovata, bilocularis, subtus rima late V-formi dehiscens. Pollinia 4, 

 cerea, pyriformia vel parum applanata, per paria incumbentia, apice caudicula granulosa 

 praedita, vix v. non connexa. Rostellum horizontale vel declive. Stigma oblongum vel trans- 

 verse ellipticum, saepe basi membrana cinctum. Ovarium breve, uniloculare, sexsulcatum. 

 Capsula subglobosa. Semina permulta axique embryone interdum cotyledone distincto 

 praedita. — Herbae plerumque epiphyticae , rhizoma brevissimum vel longe repens, 

 pseudobulbi congesti vel distantes, monophylli; folia subcoriacea, saepissime distincte 

 petiolata, plana, vernatione convolutiva; scapus heteranthus, synanthus vel hysteranthus, 

 tenuis multiflorus, saepissime nutans v. pendulus. Flores parvi, labello inl'ero saepe 

 suaveolentes, raro laete colorati. 



Species hie enumeratae 72 in Asia tropica vigentes a Tenasserim et Siam per 

 peninsulam malayensem et insulas Sumatra, Borneo, Java usque ad Philippinas extensae; 

 praeeipue in illis insulis crebrae. 



Conspectus subgenerum generis Dendrochili. 



A. Seapus heteranthus v. rarissime in eadem specie heteranthus 

 et synanthus. 



a. Vagina singula sub pseudobulbo ab internodiis rhizomatis 



parum diverso Subg. I. Monochlamys. 



b. Vaginae plures sub pseudobulbo Subg. II. Eudendrochilum. 



B. Scapus synanthus v. hysteranthus. 



a. Lobus medius labelli lateralibus interdum prorsus obso- 

 letis major. 



a. Stelidia conspicua Subg. III. Platyclinis. 



ß. Stelidia rudimentaria v. nulla Subg. IV. Aphanostelidion. 



b. Lobus medius labelli lateralibus minor Subg. V. Acoridium. 



Subg. I. Monochlamys Pfitz. 



A. Labellum trilobum, lobi laterales minimi dentiformes acuti, 

 lobus medius magnus ovato-rhombeus margine erosus, steli- 

 dia latiuscula, obtusa emarginata, ala apicalis gynostemio 



brevior, bracteae ovariis paullo longiores I.D. vaginatum. 



B. Labellum integerrimum, rhombeum, stelidia linearia, longis- 



sima, bracteae ovariis triplo longiores . , . 2. D. acuminatum. 



1. D. vaginatum J. J. Smith, Übers. Gatt. Dendrochilum in Recueil trav. botan. 

 neerland. n. -I. (1904) 10; Fl. de Buitenzorg VI. 162. — Pseudobulbi anguste cylin- 

 dracei vagina singula, fere aequilonga, basi tubulosa, superne angusta, ovata, acuta, con- 

 cava inclusi in rhizomate dependente ex internodiis longis vaginis laxis magnis, tubulosis, 

 acuminatis brunneis tectis composito, ramoso, ramos linea reeta terminantes, monophylli, 

 3,5 cm longi, 5 mm crassi. Folium satis subito in petiolum brevem angustatum, ovato- 

 lanceolatum, apicem versus longe angustatum, acutum, 5-nervium, nervo medio subtus 

 solo distincte prominente praeditum, 15 cm longum, 2,5 cm latum. Scapus in pseudo- 

 bulbo adulto hysteranthus, folio longior, tenuis, nutans, 1 5 cm longus ; rhachis angulata, 

 glumis quibusdum imbricatis, erectis sub flore infimo; bracteae late ovatae, truncatae 

 convolutae, Ovaria pedicellata superantes, persistentes. Sepala triangulo-lanceolata, acuta. 

 Petala paullo minora, anguste lanceolata, acuta. Labellum trilobum, lobi laterales 

 dentiformes acuti, quartam partem labelli aequantes, lobus medius ovato-rhombeus 

 acuminatus, margine erosus, carinae 2 breves inter lobos laterales. Gynostemium breve 



