Bonjour tous
I collected this intriguing discomycete a couple of days ago on a small decorticated branch well covered with Eutypa (I suspect the tree was Acer pseudoplatanus).
When I saw the globose spores and iodine negative (both IKI & MLZ) asci, these combined made me think of Unguiculariopsis, a genus with few British records. I have collected U. ilicincola some years ago (on Ilex), and that is the total of my familiarity with the genus. I find Zhuang's monograph useful, but not completely so.

I would have assumed this to be U. ilicincola but for the fact that the excipular margin is completely different from what I expected. There is no evidence of the uncinate terminal cells one would expect, very well shown in Enrique's http://www.ascofrance.fr/search_recolte/3899

The excipulum consists of thick walled glassy cells which elongate towards the margin where they end as pigmented and lying more or less parallel. In addition a considerable number of these terminal cells bear an ornamentation of small globose bodies, which seem to be a part of the cell wall rather than a superficial coating (for example they were unaffected by 5% KOH). Perhaps the images will explain this better. I shall post images in more than one tranche as there are quite a few.

Details of the fungus are:
apothecia mostly in the region of 300-400µm when mature on ? Acer pseudoplatanus branch covered by a Eutypa species, many apo's on areas covered with damp algal growth
asci 8-spored J-, with croziers
ascospores spherical 2.7-3.3µm (so far too small for ilicincola ?)
paraphyses more or less parallel-sided; in MLZ (but not in IKI) they produced tiny globose iodine (?) particles, as can be seen in one of the photographs
excipulum as explained above (images will follow as a second batch)

any suggestions more than welcome
amitiés
Chris