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Feller - (historical term) the person who used a crosscut saw to saw a tree down.

Fitter - (historical term) the person who cut a notch on one side of the tree in preparation for cutting it down.

Food Chain - a series of organisms in which one eats or decomposes another and the transfer of food energy occurs.

Food Web - a group of interconnected food chains.

Forb Layer - layer of the forest understory containing non-woody plants.

Forbs - non-woody plants (ferns, flowers, etc.).

Forest - land based ecosystem characterized by a dominance of tree cover and containing a variety of other living and non-living organisms (e.g., soil, air, water, other plants, animals).

Forester - a person who plans and makes decisions about forests to meet goals and support healthy ecosystems.

Forest Complexity - refers to the relative number of species present in a forests composition and their interrelationships.

Forest Composition - the plant species (trees, shrubs, and forbs) present at specific time in a forest.

Forest Function - processes performed by a forest ecosystem. These include nutrient cycling, photosynthesis, providing animal habitat, etc.

Forest Health - the general condition of a forest in reference to soundness and vigor (growth).

Forest Industries - a diverse group of manufacturers that harvest, process, and use forest resources in their final products.

Forest Integrity - the condition of a forest as a whole including composition, structure, and function.

Forest Inventory - a statistically reliable survey of forestland used to estimate various measurements of quantity, quality, health, and trends of the forest.

Forest Management - the use of techniques (e.g., planting harvesting) to promote, conserve, or alter forests to meet desired outcomes.

Forest Pathologist - a person who diagnoses and determines treatment for forest pests such as insects, disease, and weather damage.

Forest Ranger - a person who fights fires in forests, grasslands, and marshes.

Forest Services - the benefits that a forest provides for humans. These may include recreation, products, aesthetics, etc.

Forest Structure - the horizontal and vertical distribution of layers in a forest, including height, diameter, and species present.

Forest Type - a category defining forests based on natural groups of different tree species commonly occurring together over large areas. Named for one or more dominating species (e.g., birch-beech-maple, maple-oak-white pine).

Forestry - the practice of creating, managing, using, and conserving forests for human benefit.

Fragmentation - the process of dividing forest into smaller patches of forest and non-forest land.

Fruit - the part of the tree that has seeds in it. It can be fruit like an apple, or a fruit like an acorn.

Fuelwood - wood used primarily for heat or for conversion to a form of energy.

Functional Diversity - the variety of functions in a forest. Functions include nutrient cycling, photosynthesis, providing animal habitat, etc.

Fungi -  threadlike, nonvascular plants lacking chlorophyll that obtain nourishment from other organic materials. Types of fungus include molds, mildews, yeasts, mushrooms, and puffballs.