The Rutstroemia is very interesting, I think it is conspecific with R. "kalevi" on the DVD. This name is unpublished, it was intended to be published by J.T. Palmer and myself long ago. The substrate looks for me as an Acer petiole, and that´s also the substrate of the two earlier finds.

I found the ectal excipulum to be heavily gelatinized! No t. prismatica but strong oblita, see below. But it´s interesting: the find made by Lothar Krieglsteiner I saw fresh and I saw only scarcely any gel in the (living) excipulum, whereas in the find from Estonia the excipulum is heavily gelatinized. You write you have only one fruitbody, but I see two on your drawing. Do you still have one? Please have another look at the excipulum.

The species is surely close to R. coracina, but that is on Quercus leaves in the mediterranean area and has broader spores and brown vacuoles in the living paraphyses. Typical for both is the brown crenulate margin.

What I´m surprized from your drawing are the multiguttulate paraphyses. Such guttulation is very very typical of R. luteovirescens (which also grows on stromatized Acer leaves). But that species has yelow apothecia and really a textura prismatica without gel! R. kalevi has Mollisia-like vacuoles in the paraphyses. I presume that the guttules you saw in the dead material are secondary, maybe induced by the iodine. By the way I saw only the apical rings to react blue in IKI, and I am sure that you saw the blue rings of the old emptied and collapsed asci among the paraphyses and were misled to believe that the latter were amyloid.