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



to acquire a fourth pollen tube, and hence become of a square form. 

 PI. XVIII. fig. 143. 



Fuchsia Devonia. F. Clintonia. F. Atkinsonia. 

 Pollen granule cylindrical, a pollen tube issuing from either ex- 

 tremity. See fig. 144, 145. 



Fuchsia fulgens. Fuchsia Thymifolia. 



F. corymbifera. F. cylindrica. 



Albuminos^. 



Francoace^e. 



Pollen granule cylindrical, three-lobed. 



Francoa racemosa. 



VlTACEjE. 



Pollen granule cylindrical, three-lobed. 



Vitis vinifera. 



Berberace,e. 

 Pollen granule cylindrical, three-lobed. 



Epimedium alpinum. 



EsCALLONIACEiE. 



Pollen granule cylindrical, three-lobed. 



Escallonia rubra. 



Grossulace^e. 



Pollen granule in its dry state obscurely six-lobed, and when 

 moist becoming circular and emitting six pollen tubes. 



Ribes grossularia. Ribes rubrum. 



ARALIACEiE. 



Pollen granule cylindrical, three-lobed. 



Hedera Helix. Aralia sambucifolia. 



Umbellifer^e or Apiace^e. 



Pollen granule most probably furnished with three membranes, of 

 a prismatic form in its dry state, with slightly contracted sides, be- 

 coming in water cylindrical, with rounded ends, and emitting three 

 pollen tubes, which issue from fissures placed in the angles of the 

 prism. See fig. 146, 147, 148. 



Conium maculatum. CEnanthe crocata. 



Daucus Carota. CE. fistulosa. 



Pastinaca sativa. Bupleurum rotundifoliuni. 



Anethum fceniculum. B. fruticosum. 



Pollen granule cylindrical, ends rounded, three fissures for the pol- 

 len tubes ; form but slightly changed by water. See fig. 149. 



Eryngium alpinum. Didiscus cseruleus. 



Dilleniace^e. 

 Pollen granule cylindrical, three-lobed. 



Hibbertia dentata. Candollea cuneiformis. 



