Myriolecis salina?
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I’d appreciate a steer on this one. Found on a flint pebble in vegetated shingle at Shingle Street, an extensive shingle beach in VC25 East Suffolk. Growing among abundant Amandinea punctata(confirmed microscopically). Apothecia small (all >1 mm and some >0.5 mm), lecanorine and dispersed. Discs ranging from reddish brown to pale brown-grey, but both apothecium types looking identical in section. Thallus apparent only around some apothecia, and then only as small convex swellings. Prothallus apparently black, but not much of it. Hymenium short at ~60 µm. Spores colourless, aseptate, right for
Myriolecis, at ~10-12 µm by ~5 µm. Mainly fine POL+ crystals in epithecium and amphithecium, and some inspersed in hymenium, but no ‘massive’ calcium oxalate crystals in amphithecium. No reactions so far as I can tell, apart from a faint UV+ dull orange (not at all like the distinct bright orange of
M. fugiensor M. andrewii). LGBI3 is leading me to
M. salina, which it describes explicitly as a coastal lichen of siliceous pebbles. And though I haven’t detected any C+ pink reaction (at least macroscopically, as I haven’t yet tried in section), M. salinais described in LGBI3 as C± pink. The lichen also seems to agree with the description of
Polyozosia salinaon ITALIC, especially in the POL+ crystals, which don’t appear in the LGBI3 description. (That said, ITALIC doesn’t seem to hedge on the C+ pink reaction in the same way as LGBI3 does.) The UV+ reaction stands out as potential counter-evidence to both LGBI3 and ITALIC, however. At the same time, I understand from a bit of digging around that
M. salinais poorly understood as well as rarely recorded. Perhaps there’s a clearer identification that I’m just missing? Photos below.
BTW — the map and text in LGBI3 suggests that M. salina has been recorded in East Suffolk before, but there are no such records in the BLS database. Does anyone know if the records have been re-assigned to another species, and if so which one?
Many thanks,
Anthony
[attachment=9]Amandinea punctata & Myriolecis salina sp inc 20260704-CA-1.jpg[/attachment] 
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[attachment=0]Myriolecis salina sp inc 20260704-A-8.jpg[/attachment] Firstly, I’m no expert in this group, so let the buyer beware… This is mostly a northern species and while it always appears to be maritime it’s not restricted to shingle. The BLS record for Pabbay came from coastal gneiss and I’ve seen it on maritime old red sandstone from Skye (see image). Collections on shingle always look odd, presumably it’s the extremely hard substrate making it difficult for fungal hyphae to penetrate. There doesn’t seem to be any reason not to record this as
M. salina, but it could possibly also be an odd form of M. dispersa, I suppose. That seems to have a taller hymenium than yours, but I do wonder how many measurements have been made of such features. 
[attachment=0]A08936a.jpg[/attachment] The inland Suffolk records appear to be errors (possibly for
Lecanora saligna?) but Janet would have to confirm this. They are missing from current BLS maps but still accessible in GBIF via an old version of the BLS database – and also from the Fungus Conservation Trusts’s CATE2 database. Not sure how they got hold of them. Caveat emptor here too… Best wishes
Paul
Anthony These are photos from coastal shingle by the Solent:
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Field picture, flint Warren Shore, Hampshire
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Scan of specimen, flint Warren Shore, HampshireI have been identifying it from the thallus composed of rounded granules. Your one is so depurperate I can not realy say any thing about it.
Useful looking at the pictures from that day. This one was labelled
Trapelia obtegens& Amandinea lecideina, but the Trapelia obtegensis clearly Rinodina aspersa, which would be the second Hampshire site, an excellent belated find. 
[attachment=0]2013-11-15-05.jpg[/attachment]
Rinodina aspersa(center) & Amandinea lecideinaAll the best
Neil
Many thanks, Neil — it’s very helpful to see those photographs. Very helpful in more ways than one! Quite apart from
Myriolecis salina, I immediately twigged from your third photo that I might have concluded Amandinea punctatatoo quickly, and that I should have checked more carefully to see whether I had A. pelidna (lecideina)on my pebbles instead. Having looked again at the spores, it seems I do. They appear to have the characteristic ‘girdle’ from median thickening at the septum. Let me know if you disagree.
[attachment=0]Amandinea pelidna 20260704-A-7.jpg[/attachment] And as it happens, yesterday I was looking at a lichen on a siliceous gravestone that I couldn’t place, but which looked inexplicably like
Rinodina aspersaand tested C+ red. Thanks to your photo, I now know it’s just a very scattered Trapelia obtegens. Best regards,
Anthony
Anthony I have not looked at
A. pelidnafor sometime but here is some Amandinea punctataI just looked at for work: 
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Amandinea punctataspores in K, on dead Broom stem Dungeness SO I think your spores are fine for
A. pelidna. All the best
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