l.")4 



VANDE.E. 



CnAi-. VI. 



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

 diversified shapes. The pedicel is generally nearly 

 straight, but in Miltoma 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 



Y\Z- 24. 



POLLINIA OF \'aKDE/1;. 



d. viscid disc, 



ped. pedicel. 



p. pollen-masses 



The caudicles, being embedded within 



the pollen-masses, are not shown. 

 A. Polliniuni of Oncidiuni grandc 



after partial depression. 



B. PoUinium of Unnsii muculaUt 



(copied from Bauer). 



C. Pollinium of Stanhojjcu saccata 



after depression. 



D. Pollinium of Sarcaiit/ais tercti- 



folius after depression. 



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

 in some cases it is tongue-shaped, or heart-sliai)ed 

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

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

 Oneidium, with the pedicel attached at one end, instead 

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

 diatichum 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 Sarcaiithus terefifolius the disc (fig. D) is 



