Fungi Protein; complete or incomplete?

[Eric Grunden]

No plant contains all of the "essential" proteins needed
by humans, however most meats do. I know that fungi have
higher levels of protein than plants, but is that protein
complete or incomplete with relation toward humans?

While on the subject of fungi, I would like to know if
there is any organism that subsists exclusively on fungi.
If so, how would it be classified with respect toward its
diet? Is there such a thing as a "FUNGIVORE" ?

				= eg =

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The Spirit of Nature, a powerful force,
	Belongs and returns to its creative source.
- Excerpted from The Collective Works of Johnny Pokerface