Definission: Organism generally recognized as a single organism that consists of a fungus and an alga or cyanobacterium living in symbiotic association. Often attached to solid objects such as rocks or living or dead wood rather than soil.
Definission: An area of a planet's surface which is primarily covered by mosses and which is in contact with an atmospheric column extending from the planetary boundary layer to the planet's exosphere with little to no physical obstruction
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Definission: A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)
