Bonjour,
On a trouvé un petit Asco sur une clé de l'orme (je crois). Est-il Eutypella?

Found on a stick under a large elm in the Peak District, Derbyshire. Up to 4mm diameter, containing over 20 perithecia with necks. No spores were shed overnight, but large numbers of sickle shaped conidia were deposited on the slide. I couldn't find anything on the piece of bark from which these might have come.
Asci were obtained from the jelly. Thesey were about 50 um long and 7-8 wide, containing 8 spores. It was difficult to tell if the apex turned blue with Lugol as the LED lighting of my microscope is itself blueish. Spores floating freely measured 10-11 x 1.5 (approx). In water, they apppeared hyaline. Also noted were bunches of thread-like paraphyses (?), about 150 long and 3 wide.
Using Ellis and Ellis I keyed it out as Valsa, but there is no radial pattern of the ostioles. In Fungi of Switzerland Eutypella alnifraga bears some resemblance but has brown spores and is with alder. In Peter Thompson Valsa cypri is also superficially similar. Any help with this is appreciated.
Steve