Mr. Hassall on the Structure of the Pollen Granule. 561 



LoASACEjE. 



Pollen granule cylindrical, three-lobed. 

 Bartonia aurea. 



CrCURBITACE/E. 



Pollen granule cylindrical, three-lobed. See fig. 134. 

 Momordica Elaterium. 



Hamamelace^e. 

 PoUen granule cylindrical, three-lobed. 



Trichocladus crinitus. 



CORNACE.E. 



Pollen granule cylindrical, three-lobed. 



Cornus canadensis. Aucuba japonica. 



Myrtace^. 

 Pollen granule cylindrical, three-lobed. 



Punica Granatum. Leptospermum ambiguum. 



Pollen granule triangular, that of Calothamnus villosus possessing 

 three membranes, and the extine of Angophora racemosa exhibiting 

 three radiating lines ujion its surface, PI. XVll. fig. 135, 136, 137. 

 Melaleuca hypericifolia. Angophora cordata. 



Calothamnus villosus. Tristania neriifolia. 



Angophora racemosa. 



MELASTOMACEiE. 



Pollen granule cylindrical, three-lobed. 

 Melastoma corymbosa. I\I. heteromalla. Arthrostemma lineata. 

 Onagrace^. 

 Pollen granule furnished with four membranes ; either triangular, 

 and emitting three pollen tubes, one from each angle; or cylindrical, 

 and sending forth two pollen tubes ; this difference of form arising 

 merely from the suppression of one of the poUen tubes. Generally 

 separate, but sometimes united in threes or fours. 

 Pollen granule triangular, separate. 



Lopezia coronata. L. racemosa. Gaura biennis. 

 Pollen granule united in threes. 



Epilobium hirsutum. 

 Pollen granule united in fours. PI. XVIII. fig. 138. 



Epilobium roseum. 

 Pollen granule triangular, separate. See fig. 139, 140, 141. 

 Epilobium angustifolium. Oenothera biennis. 



Clarkia elegans. CE. quadrivalva. 



C. pulchella. QL. suftruticosa. 



Godetia rubicunda. CE. Drummondii 



Oenothera serotina. 

 PoUen granule triangular, separate. See fig. 142. 



Fuchsia coccinea. Fuchsia globosa major. 



F. gracilis. F. conica. 



F. grandiflora. F. lycioides. 



F. longipedunculata. 

 Oks. — Many of the pollen granule.^- of some hybrid Fuchsia a])pear 



