lignin

One of the things that phyloroglucin contains is lignin.

The source of lignin in the soil is dead plants.

Lignin is a biopolymer that gives support to vascular plants, and is thought to have evolved after aquatic plants took on land. many aquatic plants produce lignin or lignin-like polyphenols however. There is still debate on distinguishing terrestrial from aquatic plant lignin.

Franciska Sundholm has written:

'EPR studies of compounds related to lignin' -- subject(s): Lignin, Electron paramagnetic resonance

'Syntheses of lignin model compounds and assignment of their infra-red spectra' -- subject(s): Lignin