Growing through moss on stone in garden
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Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Any chance of a photo of the under surface as details of the veins and rhizines are helpful for IDing Peltigera's.
Did you consider the possibility of it being P. hymenina?
I have added two photographs of the under sides. Cannot decide if the rhizines -like features in the microscope photo are part of the lichen or moss?.
Did look at the P. hymenina but the upper surface of the lobes seemed to be smooth on Irish Lichen site, this one seems fairly crinkled. Although having gone out in the rain to look again some of the wet lobes are now looking a distinct greenish-brown so not at all sure. it is P. membranaceae
Wildlife of Assynt
I'm not sure either!
Peltigera can be another difficult one as the characteristics aren't as clear cut as they sound in the book and veining, rhizines etc can vary from lobe to lobe within the same thallus. Wet and dry specimens can look very different too.
Yours is missing the distinctive furry white tomentum on the lobes which is why I'm not convinced its P. membranaceae and wondered P. hymenina.
I've got a dodgy internet connection at the moment but here's the link to a glossary of lichen terms I wasn't able to add to my previous comment:
The glossary will be really useful and the postman has just delivered a copy of
'Lichens' by Frank S Dobson, although whether they will help me through the complications of Lichen identification I don't know, only time will tell.
When (if) this rain ever stops I will venture out into the garden and have a closer look at this lichen
I found Dobson's 'Lichens' a bit (very!) daunting to begin with but it's a must-have if you're interested in identifying the lichens you're finding.
They can be very variable so its worth cross-checking illustrations between Dobson and various online sites when looking for an ID.
Another smaller book that might also be of help is the 'Montane Heathland Lichen', link below.
It stopped raining for an hour or so this morning so was able to go out and look again at the lichen
Other than there being no furry white tomentum, the lobes are green when wet not brown (â€˜Lichens', Frank s Dobsom), so I am agreeing it is not P. membranaceae.
This Lichen is growing through moss on a stone.
The thallus is about 17 cm across.
The smooth, crinkled lobes are grey to dark brown when dry, turning a dark green when wet.
The underside of the lobes are cream with simple paler rhizines with little branching, only query- the ones I have looked at seem to end in a blunt point I cannot see tufted tips?.
There are a number of red-brown apothecia that are longer than broad.
So on balance I now thinking it is P. hymenina
Lat/Lng: 58.1, -5.3
OS grid ref: NC0720