has favoured me. Neither indeed do more than two species 

 exist in Dr. Von Martius's extensive Brazilian Herbarium, 

 one of which is Br. tuberculata, and the other the following 

 new species. 



B. Martiana ; labello ovali acuminato ciliato-dentato sessili, petalis sepalisque 



linearl-lanceolatis acuminatis longioribus, clinandrio cucullato inciso. 



Brazil, on the banks of the Rio Negro, Martius. — Leaves subulate, chan- 

 nelled, 1| foot long. Flowers white. — Next B. cucuUata. 



