Fascicle 



A dense cluster or bundle such as three to five leaves 

 in groups on pine trees. 



Fauna 



A collective term to include all the kinds of animals in 

 an area or in a geological period. 



Fauna! Region 



An area containing characteristic kinds of animals, e.g., 

 the Oriental Region, (q. v.). 



Fecundity 



Capability of an organism to produce reproductive units 

 such as eggs, sperms, or asexual structures, cf. Fertility. 



Feed 



Harvested forage including hay or fodder, or grain, grain 

 products, and other foodstuffs that are processed for feeding 

 livestock. 



Feedback 



The return of a substance to a former condition or loca- 

 tion, such as the absorption of calcium by plants and the 

 return to the soil when the leaves fall to the ground and 

 decay. 



Fell, Fell-field 



A tract of bare, elevated country which is in more or 

 less uncultivated condition. 



Felling 



In selective felling only certain trees are cut down in a 

 forest, in clear felling all are taken. 



Fen 



A tract of low, marshy ground containing peat, relatively 

 rich in mineral salts, alkaline in reaction, situated in the 

 upper parts of old estuaries and around fresh-water lakes, 

 vegetationally distinct from Moors (q. v.). 



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