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Black Tar Lichen
Black Tar Lichen forms a black layer encrusting rocks in the upper littoral and splash zones.
See https://www.marlin.ac.uk/habitats/detail/120/verrucaria_maura_on_littoral_fringe_rock
https://www.theseashore.org.uk/theseashore/V.maura SRS(US).html
Verrucaria maura is a lichen that forms a thin, matt-black layer on rock surfaces that can resemble an oil stain. Reproductive bodies may be present as tiny black spots. Under magnification the surface is seen to be covered with a mesh of fine cracks that resemble dried mud.
Thallus extensive, black, cracked-areolate, matt and minutely dotted; perithecia up to half-projecting above the surfaces of the areoles, conical. Often dominant on coastal rocks, forming a zone at and above the high.. more
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