Natterjacktoad's picture

Verrucaria nigrescens

Observed: 14th March 2013 By: Natterjacktoad
S159 Neighbourhood Nature - course complete
Natterjacktoad’s reputation in Fungi and LichensNatterjacktoad’s reputation in Fungi and LichensNatterjacktoad’s reputation in Fungi and Lichens

On gravestone


Caution: Do NOT use iSpot to identify fungi to eat!

Some fungi are very poisonous so a mistaken ID could have serious consequences.

Species interactions

No interactions present.


Natterjacktoad's picture

Many thanks for that. Do you

Many thanks for that. Do you have time to explain why my ID is wrong? I am really struggling with lichens!

Higher resolution photo posted.

Sarah Patton

synan's picture


Hi Sarah

Your high-resolution photo confirms my suspicion. I think.

Why isn't it V. nigrescens? That species has a thinner thallus, divided by cracks into smaller 'islands' (areoles) with a smooth surface. In contrast, P. nigrum is densely covered in isidia, giving it the granular appearance discernable even in the low-res photo. The thallus is also a bit patchy where some of the areoles have fallen away, something that tends not to happen with V. nigrescens.

The blue-black margin (prothallus) of P. nigrum can't be seen here, but is another distinctive feature to look for in the field.

Links to my observations for comparison:

If you enlarge my photo of V. nigrescens, its black, immersed fruit bodies (perithecia) can be seen. When P. nigrum is fertile, it produces different fruit bodies (apothecia) that are disc-like and not immersed. For photos of fertile P. nigrum, see:

Again, notice the prothallus.

Hang on in there; lichens do get easier. Well, a few of them do.


Natterjacktoad's picture

Many thanks Nigel - much

Many thanks Nigel - much appreciated!

Micro moths seems a doddle in comparison!

Sarah Patton