Mr. Hassall on the Structure of the Pollen Granule. 553 



Caprifoliace^. 

 Pollen granule large, cylindrical, three-lobed ; extine oi Leycesteria 

 formosa dotted with a few small spines. 



Viburnum Lantana. Sambucus Ebulus. Leycesteria formosa. 



ClNCHONACE^. 



Pollen granule cylindrical, three-lobed in its dry condition. See 

 fig. 73, 74. 



Serissa fcetida. Pavetta Caffra. Burchellia capensis. 



Pollen granules of Oxyanthus speciosus united in fours in the 

 same manner as those of Salpiglossis atropurpurea, from which I 

 cannot discover that they differ in any more material respect than 

 size. See fig. 72. 



GOODENIACE.E. 



Pollen grain flattish, somewhat triangular, united in fours, the 

 union of which forms an oval figure ; each of the two lateral 

 granules, which are somewhat larger and more in contact with each 

 other than those v.hich form the ends of the oval figure, contain 

 eight apertures for the passage of pollen tubes, one placed at each 

 free angle of the granule, and three on either surface, while the 

 end ones have each but six apertures, one at each free angle and 

 two on either surface. See fig. 75. 



Lechenaultia formosa. 



Campanulace^. 

 Pollen granule spherical ; pollen tubes varying from three to five, 

 and issuing from apertures placed upon the equator of the granule. 

 Extine slightly spinous. See fig. 76, 77. 



Campanula pyramidalis. Campanula Speculum. 



C. pumila alba. C. rotundifolia. 



C. patula. 



LOBELIACE^. 



Cylindrical, three-lobed. See fig. 78. 



Siphocampylus bicolor. Lobelia decumbens. L. erinus. 

 Lobelia teucroides. L. ignea. 



MONOPETAL^. 



POLYCARPOS/E. 



Cob.eacejE, Don. 

 Pollen granule globular, covered with an elevated hexagonal reti- 

 culation, which is apparently formed by the apposition of a number 

 of elongated cells placed vertically in reference to the circumference 

 of the granule ; apertures amounting to about fort}', each being 

 situated in one of the hexagonal spaces formed by the reticulation, 

 and surrounded by a circle of six hexagonal spaces not perforated 

 with apertures. The sides of those hexagons in which apertures 

 are placed are all of equal length, while the unpcrforated ones have 

 three short and three long sides. PI. XV. fig. 79. 



Cobeea stipularis. Cobeea scandens. 



PoLEMONIACE.E. 



Pollen granule describing a circular flattened disc ; pollen tubes 

 Ann. ^- Mag. N. Hist. Vol. ix. Suppl. 2 O 



