THE ANGIOSPERMAE 



1559 



fibrous coat and there is an internal air-space, both features increasing 

 buoyancy. Another Mangrove tree, Aegiceras majtis, is dispersed by its 



Fig. 1420. — Cerbera adollam. Apocynaceae. 

 Fruit with fibrous, corky mesocarp sur- 

 rounding the hard endocarp. 



seedlings, which germinate quickly in the sea and then float about for some 

 time. So also do the viviparous seedlings of Rhizophora, to be described 

 later. A number of investigators, among whom may be mentioned Darwin, 

 Guppy and Schimper, have experimented on the length of time during 



Fig. 142 1. — Heritiera littoralis. Sterculiaceae. 

 Floating fruit. 



