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



Loasace^e. 

 Pollen granule cylindrical, three-lobed. 



Bartonia aurea. 



CuCURBITACEJS. 



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



Momordica Elaterium. 



Hamamelace^e. 

 Pollen granule cylindrical, three-lobed. 



Trichocladus crinitus. 



Cornace^e. 

 Pollen granule cylindrical, three-lobed. 



Corpus canadensis. Aucuba japonica. 



Myrtace^e. 

 Pollen granule cylindrical, three-lobed. 



Punica Granatum. Leptospermum ambiguura. 



Pollen granule triangular, that of Calothamnus villosus possessing 

 three membranes, and the extine of Angophora racemosa exhibiting 

 three radiating lines upon its surface. PI. XVII. fig. 135, 136, 137. 

 Melaleuca hypericifolia. Angophora cordata. 



Calothamnus villosus. Tristania neriifolia. 



Angophora racemosa. 



Melastomace^e. 

 Pollen granule cylindrical, three-lobed. 

 Melastoma corymbosa. M. heteromalla. Arthrostemma lineata. 

 Onagrace^e. 



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 pollen tubes. Generally 

 separate, but sometimes united in threes or fours. 

 Pollen granule triangular, separate. 



Lopezia coronata. L. racemosa. Gaura biennis. 

 Pollen graaule 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. CEnothera biennis. 



Clarkia elegans. CE. quadrivalva. 



C. pulchella. CE. suffruticosa. 



Godetia rubicunda. CE. Drummondii 



CEnothera serotina. 

 Pollen granule triangular, separate. See fig. 142. 



Fuchsia coccinea. Fuchsia globosa major. 



F. gracilis. F. conica. 



F. grandiflora. F. lycioides. 



F. longipedunculata. 

 Obs. — Many of the pollen granules of some hybrid Fuchsia appear 



