Lignin  - Lignin is natural cement.  Lignin is a complex three-dimensional substance that is like a natural "cement".  Lignin’s are complex three-dimensional polymers of phenol propane units.
    Some mycorrhizae grow between old, dead leaves, and in brown-rotted wood suggesting that the fungi may be able to digest lignin.  When lots of lignin came in trees, lots of dinosaurs left the earth.

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