Mr. Hassall on the Structure of the Pollen Granule. 557 



Acacia decipiens. Acacia ciliata. 



A. nigricans. A. pulchella. 



Pollen granules cohering in sixteens. See fig. 107. 

 Acacia undulsefolia. Acacia trigonocarpa. Acacia sulcata. 



A. marginata. A. Lophantha. A. linearis. 



A. decurrens glauca. A. fiavescens. A. ruscifolia. 



C-CSALPIXE^. 



Pollen granule cylindrical, three-lobed. 

 Cassia australis. 



Papilionacb^. 

 Pollen granule elongated, more or less prismatic, with three fis- 

 sures for the escape of pollen tubes. See fig. 108. 



Pterocarpus erinaceus. Trifolium pratense. 



P. echinatus. jMedicago arborea. 



Faba vulgaris. Anthyllis polycephalus. 



Pisum sati\aim.. Ononis hircina. 



Hedysarum Onobrychis. Cytisus capitatus. 



Astragalus virescens. Genista tinctoria. 



Swainsonia alba. Spartium scoparium. 



Colutea arborescens. Lupinus luteus. 



Indigofera psoraloides. Viminaria denudata. 



Psoralea glandulosa. Virgilia capensis. 



Callistachys ovata. Sophora racemosa. 



Lotus corniculatus. 

 Pollen granule provided with three membranes, triangular, sides 

 nearly straight. See fig. 109. 



Erythrina laurifolia. 



Amygdale^. 

 Pollen gi-anule cylindrical, three-lobed. 

 Amygdalus persica. Prunus Cerasus. Armeniaca vulgaris. 



A. Isevis. P. domestica. 



PoME^. 



Pyrus Malus. P. communis. 



ROSACE-E. 



Spiraea ulmifolia. Agrimonia nepalensis. Fragaria vesca. 



S. ariEefolia. Geum sinense. Rosa bracteata. 



S. Ulmaria. Potentilla anserina. Rubus fruticosus. 



Agrimonia Eupatoria. P. argentea. 



Many of the granules in Rosa bracteata, and nearly all of Rubus 

 fruticosus, are four-lobate. 



Gynobaseos.e. 



LlMXAXTHACEiE. 



Pollen granule reticulated, bent twice nearly at right angles ; 

 pollen tubes three, one issuing from each end and one from the 

 centre of the granule. PI. XVI. fig. 110, 111. 

 Limnanthu!< Douglassii. 



