ns2658's picture

Parmotrema perlatum

Observed: 27th February 2012 By: ns2658
S159 Neighbourhood Nature - current student
ns2658’s reputation in Fungi and Lichensns2658’s reputation in Fungi and Lichens
Parmotrema perlatum2
Parmotrema perlatum3

Originally posted here: http://www.ispot.org.uk/node/249149?nav=users_observations
but have reposted with a new improved photo. The yellow lichen has been identified as Xanthoria parietina. This observation is to identify the grey green lichen.


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.


Refugee's picture


Could it be that the weather has done something to it?
Xanthoria parietina has been seen looking like "dayglow" paint this year. I have seen it like this and also another specimen that was the more normal orange.
The old photo looked like a bit of plastic that had been blown into the tree by the wind..


synan's picture


... depends on exposure to sunlight. In strong sun, Xanthoria makes a lot of the yellow/orange pigment parietin, which acts as sunscreen for its algal partner. In shade, the thallus can be grey.

We may not have parasitism here, just healthy competition. The blue-grey Xanthoria lobes are probably just a shade effect.

However, parasitism does happen. See http://goo.gl/sUtqy for an image of Xanthoria polycarpa invading Physcia stellaris.


ns2658's picture

Photographic equipment

I'm going to have to invest in some better photographic equipment. They all seemed pretty good when I was viewing them on my computer, but once uploaded here they didn't as good at all.

I do have another photo from a different tree in another garden from the same town. It might be a bit better. Should I post it here, or start a new observation?

synan's picture

New observation

If it's a different location, you should post a new observation. Only if it's the same location and the same species should you add images to an existing observation.