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2 definitions found
 for Lecanora tartarea
From The Collaborative International Dictionary of English v.0.48 :

  Litmus \Lit"mus\, n. [D. lakmoes; lak lacker + moes a thick
     preparation of fruit, pap, prob. akin to E. meat: cf. G.
     lackmus. See Lac a resinous substance.] (Chem.)
     A dyestuff extracted from certain lichens ({Roccella
     tinctoria, Lecanora tartarea, etc.), as a blue amorphous
     mass which consists of a compound of the alkaline carbonates
     with certain coloring matters related to orcin and orcein.
     [1913 Webster]
     Note: Litmus is used as a dye, and being turned red by acids
           and restored to its blue color by alkalies, is a common
           indicator or test for acidity and alkalinity.
           [1913 Webster]
     Litmus paper (Chem.), unsized paper saturated with blue or
        red litmus, -- used in testing for acids or alkalies.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Cudbear \Cud"bear`\ (k?d"b?r`), n. [Also cudbeard, corrupted
     fr. the name of Dr. Cuthbert Gordon, a Scotchman, who first
     brought it into notice.]
     1. A powder of a violet red color, difficult to moisten with
        water, used for making violet or purple dye. It is
        prepared from certain species of lichen, especially
        Lecanora tartarea. --Ure.
        [1913 Webster]
     2. (Bot.) A lichen ({Lecanora tartarea), from which the
        powder is obtained.
        [1913 Webster]

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