Coastal lichens - id help please

[chrisjohnson]

Two lichens from a sea loch on the east coast of South Uist.
Tentaive id - Ochrolechia parella and Parmelia saxatilis.
Again guidance or instructions to go and have another look would be appreciated.

many thanks

Chris

[AlanS]

I agree with both of these.

The definition of the Parmelia saxatilis photographs is not quite good enough to show the network of white lines (pseudocyphellae) or the peg-like projections (isidia) that jointly characterise this species, and the yellow tinges give brief pause for thought about Xanthoparmelia conspersa, but overall lobe-shape and appearance fit P. saxatilis.

Alan

Originally Posted by chrisjohnson

Two lichens from a sea loch on the east coast of South Uist.
Tentaive id - Ochrolechia parella and Parmelia saxatilis.
Again guidance or instructions to go and have another look would be appreciated.

many thanks

Chris

[chrisjohnson]

Hello Alan,
Thank you for the comments. Viewing the original photograph at high resolution clearly shows the pseodocyphellae and isidia. I know where this specimen was photographed, so I next time we visit the site I will have another look and check the underside.
This is one of my earlier efforts so I now have a better idea of what to look for. A copy of Dobson (used in conjunction with your website and Jenny's photographs) and a bench magnifier has made identification a little less speculative, although there is a long way to go!

Chris