jip4's picture

Black Crustose Lichen

Observed: 14th June 2012 By: jip4
S159 Neighbourhood Nature - course complete
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Species interactions

No interactions present.


AlanS's picture

Certainly not a Verrucaria,

not with conspicuous black apothecia.

The apothecia are 'lecidioid', lacking a 'thalline' margin (i.e part of the thallus tissue extending up the sides of the cup to form an often white rim, but the young apothecia do look to have a distinct rim, a so-called 'proper' margin, and possibly this is Catillaria chalybeia with a rather dark thallus.

But there are a lot of species with black, lecidioid apothecia, and even if the photograph showed them more clearly, I would say best not to speculate before the necessary microscope work.

But how could this be called Verrucaria nigrescens? It cannot possibly have matched any written description.