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Ethan CrensonHi all, Another find by a friend yesterday in Bro

30-06-2025 14:45

This is a quite common species on Nothofagus wood

I recently found a curious ascomycetes fungus in the garden.
It grew on old bodies of Diaporthe strumella on dead branches of Ribes uva-crispa.
I think it could be an Nectria episphaeria or an Nectrina purtonii.
Can anyone give me a clue on this species?
Thx,
William
https://www.fungipedia.org/setas-informacion-y-consultas/19-microscopia/71330-dialonectria-episphaeria-tode-cooke-1884-una-muy-diminuta-belleza.html
Saludos cordiales.
Isn’t Dialonectria episphaeria considered to be confined to Diatrype stigma?
Eduard
Ya indico en mi tema que en mi caso es muy probable que se trate de un Diatrype, aunque no se considera exclusiva de este, también hay autores al igual que "Les Champignons de Suisse" que lo sitúan sobe Melanomma, Chaetosphaerella y otros ascomicetos estromáticos. Tampoco afirmo en ningun momento que la que nos muestra William se trae de esta.
Dejo unos enlaces.
http://www.outerhebridesfungi.co.uk/species.php?id=156
https://www.mycodb.fr/photo.php?file=Dialonectria_episphaeria_2018_df_5.jpg&filter=
https://www.mycoquebec.org/bas.php?trie=D&l=l&nom=Dialonectria%20episphaeria%20/%20Nectrie%20des%20Sphaeria&tag=Dialonectria%20episphaeria&gro=90
Saludos.

Muchas gracias por su muy interesante respuesta y archivos adjuntos.
He observado la peritecia en KOH, como usted sugirió, y de hecho decoloran el violeta profundo.
¿Se puede decidir sobre la base de esta decoloración que esto concierne a la episfaeria de Dialonectria?
Saludos cordiales,
William
http://asco-sonneberg.de/pages/gallery/nectria-episphaeria-100324-mcol-0123441.php?group_id=7051&position=14
Las dos Nectrias son difíciles de separar con solo unas muy pequeñas diferencias muy sutiles entte ambas, como las esporas un poco mas pigmentadas en la purtonii y pequeñas diferencias en sus medidas.
Saludos.

the change of color of ascomata in KOH does not allow to separate the genera, it is imperative to know the asexual morph of the specimen to identify a genus.
Fungicolous species whose ascomes turn purple in KOH or yellow in lactic acid and have an acremonium-like asexual morph belong to Cosmospora. Species with a fusarium-like asexual morph are distributed in many genera such as Dialonectria, Geejayessia, Macroconia and Stylonectria.
All the best,
Christian

according to Ellis & Ellis purtonii would have smooth spores and episphaeria fine warty spores. Can this also be accepted as a determinative characteristic?
Sincerely,
William


the ascospores are indeed warty.
As I examined the fruiting bodies again, I noticed that numerous fruiting bodies of a different kind grew around them. Could this be the anamorphic form (Fusarium sp.)?
I am currently keeping it at D.episphaeria.
Sincerely,
William
This isn't the anamorph of the nectriaceous fungus - Perhaps it's Lylea tetracoila, an anamophic fungus usually found around Eutypa-like fungi.
Cheers,
Nick