Serai 



Refers to Sere (q. v.). 



Serclimax 



A stage in a Sere before the Climax is reached and re- 

 mains in that stage indefinitely, e.g., tule marshes in Califor- 

 nia, cf. Subclimax, Plagioclimax. 



Sere 



The series of stages that follow one another in an ecologic 

 Succession (q. v.). cf. Hydrosere, Xerosere, Subsere, Primary 

 succession. 



Serology 



The study of the reactions of blood serums to the intro- 

 duction of foreign substances into the body of organisms. 



Serotinal 



Refers to the latter part of the summer season, cf. Aspec- 

 tion, Estival. 



Serotinous 



Refers to late opening such as cones of some pine trees 

 which remain on the trees for several years without opening. 



Serpentine 



A rock or mineral consisting of hydrated magnesium 

 silicate. 



Sessile 



An organism that is attached to an object or is fixed in 

 place, e.g., barnacles, cf. Sedentary. 



Seston 



The aggregate of substances and organisms that float or 

 swim in water, including the Bioseston (living organisms) 

 and the Abioseston (non-living). 



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