Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
CUP MOSS, n. comb. The lichen, Lecanora tartarea.Bnff. 1812 D. Souter Agric. Bnff. 60:
It is a species of moss named cud bear or cup moss.