154 



VANDE.'R. 



Chap. Y1. 



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

 diversified shapes. The pedicel is generally nearly 

 straight, but in Miltonia dowesii 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 



POLLINIA OF VaNDE^. 



B. Pollinium ot Brassia maculata 

 (copied from Bauer). 



C. Pollinium of Stanhopea saccata 

 after depression. 



D. Pollinium of Sarcanthus tereti- 

 folius after depression. 



d. viscid disc 



ped. pedicel. 



«. pollen-masses. 



Tbe caudicles, being embedded within 



the pollen-masses, are not shown. 

 A. Pollinium of Oncidinm grande 



after partial 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 Angrsecum 

 distichum 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 teretif alius tlie disc (fig. D) is 



