Hydropunctaria maura, still often called by the older name Verrucaria maura and commonly known as tar lichen,[2] is a species of saxicolous (rock-dwelling), crustose lichen belonging to the family Verrucariaceae.[3] A perennial species that does not experience seasonal variations, it is the type species of the genus Hydropunctaria.[4] The medulla is a black basal layer that forms columns (Latin: punctae) to the upper surface and isolates the algae into pockets near the upper surface. The black band formed by H. maura can often be seen at a distance as a marker of the high water point.
^Cite error: The named reference Species Fungorum synonymy was invoked but never defined (see the help page).
^David Chapman (2008). Exploring the Cornish Coast. Penzance: Alison Hodge. p. 119. ISBN 9780906720561.
^"Hydropunctaria_maura". www.mycobank.org. Retrieved 5 February 2021.
^Bergillos, Rafael J.; Rodriguez-Delgado, Cristobal; Cremades, Javier; Medina, Luis; Iglesias, Gregorio (December 2020). "Multi-criteria characterization and mapping of coastal cliff environments: A case study in NW Spain". Science of the Total Environment. 746: 140942. Bibcode:2020ScTEn.746n0942B. doi:10.1016/j.scitotenv.2020.140942. hdl:2183/26298. PMID 32763597. S2CID 221074642.
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