Bonsoir tous
I have collected a Rubus fruticosus agg. stem. which has a number of rather scattered apothecia of what I take to be an Orbilia. Unfortunately while I have been able to find some asci (distinctly flat-topped) I cannot see anything meaningful within them (this from preparations of two of the most mature apo's). There is an anamophic fungus growing around the apothecia, but it is Endophragmiella boothii (see last image) i.e. anamorphic Melanommataceae (Pleosporales) so not connected. Of considerable interest in one of the mounts is a stray perithecium of what I take to be Wentiomyces sibiricus (but that is another story).
Clearly this means it is impossible to take the Orbilia to species level; however, based on a number of other characters I wonder whether it could at least be taken to a possible section within the genus - it would all add to my stumbling efforts to understand a little more of this fascinating group of ascomycetes.
The characters are:
*  The shape of the apothecia, all are more or less bowl-shaped and with a distinct thick margin at all stages of growth, as can be seen from the images.
*  The marginal cells which have globose to elliptical pigment held centrally in many of the individual cells; this being pale pink and giving the orange-pink coloration of the apothecia.
*  The paraphyses, which are neither capitate nor held together in an epithecium.
*  Finally, possibly the habitat? Though I appreciate many Orbilia spp. are not  
host-restricted.

Perhaps a a forlorn hope / mince espoir / verlassene Hoffnung - but any thoughts would be welcome

Amitiés
Chris