Ginny B's picture

Ochrolechia parella

Observed: 16th July 2012 By: Ginny B
S159 Neighbourhood Nature - course complete
Ginny B’s reputation in Fungi and LichensGinny B’s reputation in Fungi and LichensGinny B’s reputation in Fungi and Lichens
Ochrolechia parella
P1030547_Ochrolechia parella

Picture 1 - Rather cracked white thallus with whitish, pruinose apothecia. Picture 2 was higher up the same granite rock, looked more crumbly and had more apothecia with darker fruit discs. I'm not totally convinced they are the same lichen but have failed to find what seems a good match.


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

Species interactions

No interactions present.


AlanS's picture

Need clearer definition

Photographing crustose lichens is always difficult.

Left hand photograph does look like it is Ochrolechia parella, but I cannot see it clearly enough.

As you suspect, the right-hand photograph is different and has black apothecia. It is either Tephromela atra or Lecanoria gangaleoides - the two are very similar and often grow together on coastal rocks. This one has a slightly untidy look and thick thallus, which makes me think it is L. gangaleoides, but it needs to be confirmed either from a section of the apothecium or, usually more simply, by digging away at the thallus with a finger-nail. The deeper tissues of L. gangaleoides contain an orange pigment.


Posted 18 July, typo corrected 19 July.

Ginny B's picture

Thank you for your help

Thank you for your help with these two. I'll try and get better pictures of each and do a spot of scratching too!