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 undukefolia. 

 A. marginata. 



Acacia trigonocarpa. 

 A. Lophantha. 

 A. flavescens. 



Acacia sulcata. 

 A. linearis. 

 A. ruscifolia. 



A. decurrens glauca. 



CLesalpine^e. 

 Pollen granule cylindrical, three-lobed. 



Cassia australis. 



Papilionaceje. 



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

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



Pterocarpus erinaceus. 

 P. echinatus. 

 Faba vulgaris. 

 Pisum sativum. 

 Hedysarum Onobrychis. 

 Astragalus virescens. 

 Swainsonia alba. 

 Colutea arborescens. 

 Indigofera psoraloides. 

 Psoralea glandulosa. 

 Callistachys ovata. 



Trifolium pratense. 

 Medicago arborea. 

 Anthyllis polycephalus. 

 Ononis hircina. 

 Cytisus capitatus. 

 Genista tinctoria. 

 Spartium scoparium. 

 Lupinus luteus. 

 Viminaria denudata. 

 Virgilia capensis. 

 Sophora racemosa. 



Lotus corniculatus. 

 Pollen granule provided with three membranes, triangular, sides 

 nearly straight. See fig. 109. 



Erythrina laurifolia. 



Amygdale^e. 

 Pollen granule cylindrical, three-lobed. 

 Amygdalus persica. Prunus Cerasus. 

 A. lsevis. P. domestica. 



Armeniaca vulgaris. 



Pyrus Malus. 



Pome.e. 



Rosacea. 



P. communis. 



Spiraea ulmifolia. Agrimonia nepalensis. Fragaria vesca. 



S. arisefolia. 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. 



LlMNANTHACEJE. 



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. PL XVI. fig. 1 10, 1 1 1 . 



Limnanthus Douglassii. 



