106 



considered to indicate coalescence noi' consequently to prove 

 pseudo-dimery. 



Therefore it is impossible to distinguish real and pseudo- 

 dimery when the labellum is wholly absent. 



In Calanthe triplicata the labellum tends to take a colour 

 and often turns pale orange when fading. This colour in the 

 same as shown by the appendages of the petals, which we 

 suppose therefore to originate in the labellum and to be 

 rudiments of the same. 



Dendrohium cpnbidioides Lndl. 

 Coll. Dr. J. J. S. Pangerango 1899. 

 Habitat Java. 



Pseudo-tuber at the end of which a fresh tnber has deve- 

 loped. 



Vanda Hookeriana Rchb. f. 



Coll. J. Hulshoff Pol, Buiteuzorg 1908. 



Habitat Banka, Sumatra, Malay Peninsula. 



Two flowers grown together. The ovaries, 30 m. m. long, 

 run up parallel and are separated by a groove. At their base 

 two small rounded bracts. The upper sepals remain free, but 

 of the lateral ones, the two which face one another, completely 

 coalesce (synanthy). 



The flowers springing higher up from the peduncle are single, 

 but judging from the cicatrices there have been some more 

 synanthies. 



As the flowers of Vanda are always alternate, there must 

 be found some cause accounting for the exceptional presence of 

 two flowers at the same height, whether it be bifurcation of 

 the pedicel, or reduction of the internode, or perhaps an addit- 

 ional flower. 



Phalaenopsis amahilis Bl. 



Coll. Mr. Schreuders, Bandong 1910. 



Hab. Malay Archip. and Peninsula, Philippines. 



Flowers with petals, which above the claw are very concave 



