roccella

Noun
  1. A source of the dye archil and of litmus (synset 113009767)
    is a type of: lichen - any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc.
    belongs to: genus roccella - chiefly fruticose maritime rock-inhabiting lichens
    same as: roccella tinctoria

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