Hi Gilbert

I would also like to know that. Once I thought that these might be two species, but later I gave it up. Now when looking at your images, this reminds me very much of my recolte on Fraxinus near my house a few years ago.

Here the text in my key: 

Ectalexcipulum of vertically oriented, slightly gelatinised textura prismatica-angularis, cortex of large, spherical, dark red-brown incrusted cells, apothecia externally not fibrous, excipulum and hymenium numerous covered by numerous rhomboid oxalate crystalls, asci nearly IKI-, apothecia emerging from sclerotia hidden in the cortex, with early black-brown hymenium, spores *12-16.3 x 3-4 µm, very low lipid content, on branches of Populus and Fraxinus ....... E. fascicularis
(a suspected deviation of Populus compared to Fraxinus, especially due to a brown layer between ectal excipulum and medulla in Populus finds as asserted in Baral & Krieglsteiner (1985: 116) needs further observation)

Zotto

Merci Zotto.
Mon matériel était assez vieux et je n'ai pas fait de coupe de la chair.
Je classe donc ma récolte sous Encoelia fascicularis (mais qui n'est pas fasciculée...)
Gilbert

Yes, it is very complicated and subtle because the fungus is variable. On Fraxinus indeed exist also fasciculate apothecia.

Zotto

Vielen Dank.
Freunschäftlig
Gilbert