Sentence:  ORCHELLA WEEDS. The cylindrical and flat species of Roccella used in the manufacture of Orchil or Archil, and <WSD>Cudbear</WSD>, are so called by the makers. 
Meaning of the word marked with <WSD> tags:  A violet-red powder, difficult to moisten with water, prepared from certain lichens, especially (ver=180408) (syn. "Lecanora tartarea"), and used for making violet or purple dye.