Ramalina siliquosa, also known as sea ivory,[2] is a tufted and branched lichen which is widely found on siliceous rocks and stone walls on coastlands round the British Isles, occasionally slightly inland. It grows well above the high-tide mark but is still very tolerant of salt spray. The branches are flattened and grey, and bear disc-like spore-producing bodies. It forms part of the diet of sheep in Shetland and on the coast of North Wales.[3] It is found in Iceland where it has a conservation status of a vulnerable species.[4]

Ramalina siliquosa
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Lecanorales
Family: Ramalinaceae
Genus: Ramalina
R. siliquosa
Binomial name
Ramalina siliquosa
(Huds.) A.L.Sm. (1918)

Lichen siliquosus Huds. (1762)



The species was originally described as Lichen siliquosus by the botanist William Hudson in 1762.[5] It was transferred to the genus Ramalina by Annie Lorrain Smith in 1918.[6]


  1. ^ "Ramalina siliquosa (Huds.) A.L. Sm. 1918". MycoBank. International Mycological Association. Retrieved 2011-06-08.
  2. ^ Sarah Carter (2019). "MOSSES, LICHENS, FUNGI AND FERNS IN CORNISH HEDGES" (PDF). Cornish Hedges Library. p. 10. Retrieved 17 August 2022.
  3. ^ "Sea ivory - Ramalina siliquosa". MarLIN. The Marine Life Information Network. Retrieved 2013-10-19.
  4. ^ Icelandic Institute of Natural History (1996). Válisti 1: Plöntur (in Icelandic). Reykjavík: Náttúrufræðistofnun Íslands.
  5. ^ Hudson W. (1762). Flora Anglica (in Latin). p. 460.
  6. ^ Smith AL. (1918). A Monograph of the British Lichens. Vol. 1 (2 ed.). p. 172.