15i 



VANDEi^. 



Chap. VL 



it is almost cylindrical (fig. C) but often of the most 

 diversified shapes. The pedicel is generally nearly 

 straight, but in Miltonia clowesii it is naturally curved ; 

 and in some cases, as we shall immediately see, it 

 assumes, after removal, various shapes. The extensible 

 and elastic caudicles, by which the pollen-masses are 

 attached to the pedicel, are barely or not at all visible, 

 being embedded in a cleft or hollow within each 

 pollen-mass. The disc, which is viscid on the under 

 side, consists of a piece of thin or thick membrane of 



Fig.2K 



i'OLLlXlA OP VaSDE^E. 



d, viscid disc. 



ped. pedicel. 



p. poUen-iDiisses. 



Tbe caudicles, being embedded within 



the pollen-masses, are not shown, 

 A. Pollinium of Oncidium grande 



after partial depression. 



B. Pollinium ct Brmsia maculata 



(copied from Bauer). 



C. Pollinium of Stanhopea saccata 



after depression. 



D. Pollinium oi Surcanthis iercti- 



foUus after depression. 



varied forms. . In Acropera it is like a pointed cap • 

 in some cases it is tongue-shaped, or heart-shaped 

 (fig. C), or saddle-shaped, as in some Maxillarias, or 

 like a thick cushion (fig. A), as in many species of 

 Oncidium, with the pedicel attached at one end, instead 

 of, as is more usual, nearly to the centre. In Angrseeum 

 distichvm and sesquipedale the rostellum is notched, 

 and two separate, thin, membranous discs can be 

 removed, each carrying by a short pedicel a pollen- 

 mass. In Sarcanthus teretifolius the disc (fig. D) ia 



