Hi again!
Yesterday I found this Ciboria on a Quercus pyrenaica stromatized fruit. A stromatized area can be found at the base of the apothecia. Because Ciboria batschiana has always two nucleus?, it cannot be my species. I see that there is other species on the same host: Ciboria americana. So my question is if mine can be Ciboria americana.
Spores with one nucleus: 9-12 x 4-5 µm, nearly no oil drops, with spore sheath.
Paraphyses with one large refractive VB in the upper segment, width up to 4-5,5 µm.
Subhymenium slightly brown-pigmented, reactng light blue in IKI and enhanced in IKI after KOH.
Medulla: more or less hyaline textura intricata parallel to hymenium, also a bit reacting light blue in IKI but only noticed after KOH.
Asci: up to 95 x 9,5 µm, arising from croziers, euamyloid, Sclerotinia-type.
Ectal excipulum composed by pigmented (brown-reddish) rounded cells which protrude at margin and in outermost cells. Some bear VBs. No reaction in IKI, even after KOH.
I think there is enough data in the PDF file, but I have more photos if you need.
Thanks in advance,
Raúl.