lichen
A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.Ramalinaceae. It was first described by Finnish lichenologist William Nylander in 1872 as ''Ramalina scopulorum'' var. ''subfarinacea''. Nylander promoted it to species status in another publication that year.
''Ramalina subfarinacea'' is known to contain both
stictic acid
Stictic acid is an aromatic organic compound, a product of secondary metabolism in some species of lichens.
Stictic acid is the subject of preliminary biomedical research. Stictic acid has cytotoxic and apoptotic effects ''in vitro''. Computation ...
and
usnic acid
Usnic acid is a naturally occurring dibenzofuran derivative found in several lichen species with the formula C18H16O7. It was first isolated by German scientist W. Knop in 1844 and first synthesized between 1933-1937 by Curd and Robertson. Usnic a ...