GLOSSARY 387 



Stoma (pi. Stomata) : an epidermal organ for regulating the communi- 

 cation between green tissue and the air. 



Strobilus : a cone-like cluster of sporophylls. 



Style: the stalk-like prolongation from the ovary which bears the 

 stigma. 



Symbiont: an organism which enters into the condition of symbiosis. 



Sy'mbiosis : usually applied to the condition in which two different 

 organisms live together in intimate and mutually helpful relations. 



Syjipetalous : applied to a flower whose petals have coalesced. 



Syncarpous : applied to a flower whose carpels have coalesced. 



Zoospore : a motile asexual spore. 



Zy t gote : the sexual spore resulting from conjugation. 



