ryjocl93's picture

Lichen on fence

Observed: 16th May 2013 By: ryjocl93ryjocl93’s reputation in Fungi and Lichens

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.


ryjocl93's picture

Thank you

Thanks for your ID, can you let me know what the key features are please so I can confirm the identity if possible. Thanks

AlanS's picture


Having just about made out the white flecks (pseudocyphellae) which, in combination with the general appearance make this a Parmelia, my next question would be whether it is producing soredia or isdia (asexual structures).

Parmelia sulcata produces soredia (minute, powdery granules) along the lines of the pseudocyphellae.
P. saxatilis and P. ernstiae instead produce isidia (peg-like structures with an outer skin).

These structures require a hand-lens and need critically sharp photographs. In the case of your photograph, the thallus is probably too immature to show them. Often is better to just say "Parmelia sp." and normally I would have done so, but on the day of my ID I had just been looking at some old beeches covered primarily with P. sulcata and P. saxatilis in all stages of development and I was feeling extra confident.

Both P. sulcata and P. saxatilis are on my website if you want more info. (I haven't added P. ernstiae yet, but your photo is not that.)