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Could this be Porpidia striata, found on a siliceous stone embedded in peaty soil at the top of the Quantock Hills in Somerset? Apothecia are sessile, the largest ones being about 0.7mm diameter (one was 0.9). Most of the apothecia are striate to some extent although none as beautifully as on the cover of LGBI3 vol.40. The exciple is reddish brown internally with a carbonaceous ‘crust’. The hymenium is c.90um and the epihymenium is brown, slightly olivaceous in K and the spores are 14 – 20 x 5 – 5.5 um.
The thallus is fairly thin and K-, K/UV (wet) -.
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