Forest Type 



A forest stand that is essentially similar throughout its 

 extent in composition under generally similar environmental 

 conditions. It includes temporary, permanent, climax, and 

 cover types. 



Form 



A botanical taxonomic category based upon more trivial 

 characteristics and with a less distinct geographical range 

 than those of the Subspecies or Variety. 



Formation 



One of the largest subdivisions of the vegetation of the 

 earth, usually of great geographical extent, composed of com- 

 munities that are similar in physiognomy and broad environ- 

 mental relations, e.g., the deciduous forest of eastern North 

 America, cf. Climax, Biome. 



Formenkreis 



A series of related forms distinguished geographically 

 and which originated entirely or primarily by geographic 

 isolation. 



Fossorial 



Refers to animals that burrow in the soil, e.g., the mole, 

 cf. Ambulatorial. 



Fragment (of a Community) 



A stand so small that it lacks the species composition 

 and other characteristics of the Community. 



Fragmented Structure (Soil) 



A soil composed largely of particles that have well defined 

 faces and edges, cf. Granular structure. 



Free-martin 



A sexually imperfect female calf, sterile usually, born as 

 a twin of a male animal. 



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