18-12-2025 21:17
Pol DebaenstThe identification took me to Byssonectria deformi
15-12-2025 07:09
Danny Newman
indet. Rutstroemiaceae sp. on unk. fallen leavesMc
19-12-2025 10:10
Patrice TANCHAUDBonjour, récolte réalisée en milieu dunaire, a
18-12-2025 17:23
Bruno Coué
Bonjour,je serais heureux d'avoir votre avis sur c
18-12-2025 18:07
Margot en Geert VullingsThese plumes were found on rotten wood.They strong
17-12-2025 18:35
Michel Hairaud
Bonjour à tous/Hi to everyone I am passing along
15-12-2025 15:48
Danny Newman
Melanospora cf. lagenaria on old, rotting, fallen
15-12-2025 15:54
Johan Boonefaes
Unknown anamorph found on the ground in coastal sa
15-12-2025 21:11
Hardware Tony
Small clavate hairs, negative croziers and IKI bb
Eutypa ?
Petra Eimann,
29-12-2019 15:54
Hello together, need help. Found 21.12.2019 in a mixed deciduous forest. Growing place was a branch of Sambucus nigra. We think it might be a Eutypa but not sure. Average spore size 4.97 x 1.47 Q=3.42, IKI Reaction not sure, if then little. Any ideas what it might be?
Jacques Fournier,
29-12-2019 18:28
Re : Eutypa ?
Dear Petra,
the identification of Diatrypaceae is most often challenging and requires the accurate observation of several characters, not only ascospores.
A common species on Sambucus is Peroneutypa scoparia, and ascospore dimensions fit fairly well. However the ascus shape on your photos is not typical for this species.
You need information on the ostioles and stromatal configuration. For the latter purpose a vertical section as you did would hav been much more informative if you had used a sharp razor blade. It is important to assess whether ascomata are widespread in a common stroma with separately emergent ostioles (Eutypa or Diatrype) or in small groups with convergent ostioles (Eutypella or Peroneutypa)
The apical ring of P. scoparia is relatively conspicuous for the genus and must be observed in Melzer's reagent after a 15 s pre-treatment in 3% KOH.
If you encounter problems with the vocabulary and the delimitation of genera, I suggest you to consult Rappaz' article (1987).-Taxonomie et nomenclature des Diatrypacées à asques octosporés. Mycologia Helvetica vol 2, n° 3, p. 285-648.
Good luck,
Jacques
Petra Eimann,
30-12-2019 00:22
Re : Eutypa ?
thank you very much Jacques, we will try again. Petra