Speleology 



The study of the conditions and the life in caves. 



Sperm 



The male sex cell or Gamete. 



Spermatogenesis 



The formation of sperms in an organism. 



Spermatophytes 



The seed-bearing plants, Spermatophyta, a section of the 

 subphylum Pteropsida, phylum Tracheophyta. It includes 

 the Gymnosperms and the Angiosperms (q. v.). 



Spermatozoon 



A highly motile Sperm occurring in animals. 



Sphagniherbosa 



Plant communities with abundance of Sphagnum and 

 with peat in the substratum, cf. Bog. 



Sphagnum 



A genus similar to the true mosses, in the subclass 

 Sphagnobrya, class Musci, phylum Bryophyta; usually occur- 

 ring in bogs. 



Sphagnum Bog 



A kind of community characterized by the presence, and 

 often the abundance, of Sphagnum, acid substrata, and the 

 accumulation of peat. cf. Bog. 



Spikelet 



One of the main parts of the inflorescence of a grass or 

 a sedge, containing one or more flowers (Florets) and asso- 

 ciated bracts or scales. 



Spillway 



A passageway for the escape of excess water around a dam. 



Spinney (Spinny) 



A copse or small grove. 



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