roccella tinctoria

[GlendynaSlese]

a source of the dye archil and of litmus

[diannvq4]

Roccella tinctoria is a species of fruticose lichen in the Roccellaceae family. It is native to the Mediterranean and known for its importance in the production of the purple-red dye called orchil (or orcein). The lichen is also known as litmus fungus and commercially used in litmus paper production.