GLOSSARY. 185 



Stamen (the warp, or thread, of cloth). The microsporophyll 



in Spe.vmatophytes. 

 Stigma (a spot or mark). The surface of a pistil without 



epidermis which receives the pollen. 

 Stigmatic. Relating to the stigma, or stigma-like. 

 Stoma, pi. stomata (a mouth). Epidermal structures which 



serve for facilitating gaseous interchanges with the exter- 

 nal air, and for transpiration of moisture. They are 



often called "breathing-pores." 

 Strobilus. A cone- like cluster of sporophylls. 

 Strophiole (a small wreath). An appendage at the hilum of 



certain seeds. 

 Style (a pillar). The usually attenuated portion of the pistil 



which bears the stigma. 

 Suspensor. A chain of cells which develops early from the 



oospore and serves to push the embryo-cell deep within 



the embryo-sac. 

 Symbiont. One of the organisms that has entered into a 



symbiotic relationship. 

 Symbiosis (living together). Applied to a condition where 



two or more organisms are living in an intimate relation- 

 ship. 

 Syncarpous (carpels united). Applied to those conditions 



where the carpels have united into a compound pistil. 

 Synerigdae, or Synergides (helpers). The two nucleated bodies 



which accompany the oosphere in the embryo-sac, and 



together with it form the egg-apparatus. 

 Testa (a shell). The outer seed-coat. 

 Tetracyclic (four cycles). Applied to those flowers in which 



there are four cycles of floral organs. 

 Tetradynamous (four-strong). Said of an andrcecium in 



which there are four long and two shorter stamens. 

 Thalloid. Thallus-like. 

 Thallus (a young shoot). The body of lower plants, which 



exhibits no differentiation of stem, leaf, and root. 

 Theca, pi. thecce (a case). The "anther-cell," that is, the 



case containing pollen; sometimes used of other spore- 

 cases. 

 Tracheary tissue. A general name given to the vessels and 



ducts found in fibro-vascular bundles. 

 Tracheides (rough-formed tissues). Tracheary cells that are 



closed throughout. 



