lpearce's picture

Tephromela atra

Observed: 7th November 2009 By: lpearcelpearce’s reputation in Fungi and Lichenslpearce’s reputation in Fungi and Lichenslpearce’s reputation in Fungi and Lichens
IMGP9144
Description:

This was growing on a old stone wall on the coast

Identifications

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.

Comments

gardener's picture

There are two very similar

There are two very similar ones common on acidic coastal rocks, Tephromela atra and Lecanora gangaleoides ......

They both test K+ yellow but if you cut the apothecia (discs) in half T. atra is purplish-red in section and Lecanora gangaleoides dark green-brown.

AlanS's picture

Slightly easier

Slightly easier in the field is to pick at the thallus with a finger-nail. In the case of Lecanora gangaleoides, yellow-orange pigment (anthraquinone) is exposed in the deeper levels of the medulla (flesh). The pigment tests K+ purple.

The photograph appears to be typical Tephromela atra.

Alan