IT. A NTS AM) IXSKCTS 



109 



anther. The antliors lie close 

 around the central stigma, 

 disk, each anther being sepa- 

 rated from the other by a 

 longitudinal slit (Fig. 88, d} 

 formed by the margins of 

 flic anthers being extended 



FIG. 90. Two pollen-masses 

 (pollinia) joined by their bands 

 (retinacula) to their central 

 body (corpusculum). The frag- 

 ment hanging down from the 

 central body between these two 

 pollen-masses is part of a leg of 

 an insect which had been caught 

 in the wedge-shaped slit in this 

 body, and which had liberated 

 itself by breaking off and leav- 

 ing part of its leg fast there- 

 in. Greatly enlarged. Photo- 

 graphed by \V. C. Stevens. 



Fin. 89. Longitudinal section of 

 milkweed, a, corpusculum ; <7, slit 

 between anthers ; n, pollen-mass 

 (polliniuin) in normal position 

 within flower. 



ont perpendicularly as a slight 

 triangular membranous expan- 

 sion. Each anther bears two 

 pollen-masses. Each of these 

 masses is called a pollinmm. 

 Hands or retinacula unite each 

 polliniuin, to a dark central 

 body, the corpusculum, situated 

 at the top of the slit. The cor- 

 pusculum is hard, horny, and 

 upon examination is found to 

 he grooved longitudinally. 

 (Fig. DO.) This wedge-shaped 

 iM'oove lies in line with the slit 

 between the anthers. The 

 lower part of the slit between 

 the anthers is wider, and leads 

 up into tin 1 so-called stigmatic 



