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Hello!I have a collection of Asterosporium asteros

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Found 13/2/25 on moss, very far away, only almond

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Jan KnuimanGrowing on a rotten twig of a broadleaf tree (Sali

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Thomas LæssøeWith hyper fusiform-pointy spores.https://svampe.d

03-03-2025 08:20

Une idée sur ces petites boules blanches sur mou

Found by a friend: february 2018.
On: dead branch of Sambucus nigra.
Asci: 8-spored.
Spore size: 5.4-6.6-7.2 x 1.4 µm (immature spores???)
Eutypa lata, Eutypa maura?
Kind regards,
Riet

likely E. maura but this species is highly specific for Acer pseudoplatanus.
Just split the branch longitudinally across the stroma and if you see deeply immersed perithecia under a thick black superficial layer and surrounded by black extensions downwards like on the attached photo, you can safely recognize this fungus.
Host identification is most often critical to identify Diatrypaceae, otherwise it is often a headache.
Good luck,
Jacques

Thank you very much for your help and advice.
I will give it a try!
Greetings, Riet

I can see "deeply immersed perithecia under a thick black superficial layer" ("and surrounded by black extensions downwards").
Are the black extensions on the photo's also correct for Eutypa maura?
The third photo I just received from the owner of the material.
Riet

Jacques

Merci beaucoup!
Riet