On some of the rugged masses of masonry grew large hoary tufts of the strange roccella or orchil-weed, which yields the famous purple dye -- with which, in all likelihood, the robes of the Cæsars were coloured -- and which gave wealth, rank, and name to one princely.    From Wordnik.com.  [Roman Mosaics Or, Studies in Rome and Its Neighbourhood] Reference

A great quantity of Lichen roccella on the basaltic rocks bathed by the waters of the sea.    From Wordnik.com.  [Travels to the Equinoctial Regions of America] Reference

Lieben roccella.    From Wordnik.com.  [Allgemeines Polyglotten-Lexicon der Naturgeschichte mit erklaerenden Anmerkungen] Reference