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Diaporthale on Juglans regia
Enrique Rubio, 30-04-2012 19:02
Enrique RubioDear friends of the forum

I need your help with this fungus that forms inmersed perithecia flask-shaped up to 250 microns. These perithecia, solitary, in pairs or in 'valsoid' groups have short or long necks with ostioles scarcely protruding and very inconspicuous. I have seen any obvious stroma or stromatic disk. No black line. I had seen these perithecia only when I cut the branch, because I was not suspecting that they are here.
The perithecia are placed just below the periderm with short necks or at some mm and then its necks are longer.
The branches of Juglans regia are 20 mm in diam. and they are liying on the ground.
I don't know a good genus for my fungus. Maybe Cryptodiaporthe?  
Many thanks again for your help.
Enrique
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Bernard Declercq, 30-04-2012 19:48
Bernard Declercq
Re : Diaporthale on Juglans regia
Hi Enrique,

Could this be Melanconis carthusiana Tul.?

Bernard
Enrique Rubio, 30-04-2012 19:51
Enrique Rubio
Re : Diaporthale on Juglans regia
Have you any bibliographic information about this species?
Merci Bernard
Enrique Rubio, 30-04-2012 19:57
Enrique Rubio
Re : Diaporthale on Juglans regia
Melanconis carthusiana is said (Wehmeyer's key)as a species with spores with no appendages...
Yannick Mourgues, 30-04-2012 20:28
Yannick Mourgues
Re : Diaporthale on Juglans regia
No gel sheat around spores ?
Melanconis is a good idea.

Docs ici :

Mycologia 16 (6) p. 257-273 de Wehmeyer.
http://www.cybertruffle.org.uk/cyberliber/59350/0018/006/0257.htm?

Mycologia 29 (5) p. 599-616
http://www.cybertruffle.org.uk/cyberliber/59350/0029/005/0599.htm?

Mycologia 32 (3) p. 321-330
http://www.cybertruffle.org.uk/cyberliber/59350/0032/003/0321.htm?
Enrique Rubio, 30-04-2012 20:44
Enrique Rubio
Re : Diaporthale on Juglans regia
No gel around the spores, even in China ink.
No information about M. carthusiana in these papers (¡)
Tnaks Yannick
Yannick Mourgues, 30-04-2012 21:39
Yannick Mourgues
Re : Diaporthale on Juglans regia
Et oui ! Bad luck. I'have just found this (Saccardo-See attached file) for M. carthusiana . You can also find pictures of spores on internet. They are absolutly not as yours. May be you can see Zotto's picture on his CD if you have it.
Good luck.
Yannick
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Stoykov Dimitar, 02-05-2012 08:57
Stoykov Dimitar
Re : Diaporthale on Juglans regia
Fear Enrique,

My suggestion is to see Wehmeyer (1941), the monograph on Phragmoporthe, Titania, Melanconis, etc.

It is similar to Melancois juglandis (Ellis & Everh.) A.H. Graves, Phytopathology 13: 311, 1923, but bears quite longer asci.
Kind regards,

Dimitar
Enrique Rubio, 02-05-2012 12:09
Enrique Rubio
Re : Diaporthale on Juglans regia
Thank you to all, Yannik and Dimitar
Paul LEROY, 02-05-2012 22:41
Re : Diaporthale on Juglans regia : réponse à Enrique Rubio
Bonjour Enrique,
La description de ce spécimen (mensurations des asques avec appareil apical bien évident,forme
et mensurations des spores ainsi que la disposition des périthèces dans le substrat) convient
parfaitement pour Melanconis appendiculata(Otth)Wehmeyer=Prosthecium appendiculatum(Otth)
M.E.Barr. Le problème est que cette espèce ne se développe que sur Acer sp. Alors, s'il n'y a pas erreur d'identification du support je n'ai rien d'autre à proposer. Car,à ma connaissance,les quelques espèces venant sur Juglans ne correspondent pas à votre récolte. Félicitations pour vos photos,  elles sont d'excellente qualité.
Amicalement
Paul LEROY
Enrique Rubio, 03-05-2012 19:37
Enrique Rubio
Re : Diaporthale on Juglans regia
Thank you, Paul
I think my branches are of Juglans regia because there are only three trees in a open meadow and the branches are clearly fallen. In this place there are Acer pseudoplatanus too, but they are to a 200 m of this place.
I have seen on the web the next paper on Melanconis:
NEW SPECIES FROM THE FAMILY MELANCONIDACEAE (DIAPORTHALES) IN LITHUANIA.
Ruk?eniene, Jone // Botanica Lithuanica; 2005, Vol. 11 Issue 3, p195
with a description of Melanconis appendiculata.

Maybe have you this paper?   
Best regards
Enrique  
Yannick Mourgues, 03-05-2012 23:32
Yannick Mourgues
Re : Diaporthale on Juglans regia
Where did you find it ?
Yannick
Paul LEROY, 04-05-2012 11:04
Re : Diaporthale on Juglans regia; re-reponse à Enrique Rubio
Hello!Enrique,
A propos de la Melanconidaceae sur "Juglans!.."si le support est parfaitement identifié je n'ai
aucune autre espèce convenable à proposer Toutefois je précise que M.appendiculata a des
spores assez volumineuses,longtemps hyalines et uniseptées dans les asques. Mais à pleine
maturité les spores brunissent(c'est pourquoi Saccardo avait placé cette espèce dans le
genre Melanconiella)et enfin triseptées,donc il s'agit d'un Prosthecium. Dans le cas de cette
récolte il faut d'abord confirmer l'authenticité du support et vérifier si de nombreuses spores
sont présentes autour des ostioles(visible avec une forte loupe). Si c'est le cas vérifier  un
prélevement au microscope. Si rien ne convient à ce que je suppose,alors j'abandonne. A
moins de vérifier un échantillon en parfait état.
Affaire à suivre, très amicalement   Paul LEROY
Enrique Rubio, 04-05-2012 20:40
Enrique Rubio
Re : Diaporthale on Juglans regia
Merci beaucoup de ton savant aide, Paul
Enrique Rubio, 19-01-2017 20:58
Enrique Rubio
Re : Diaporthale on Juglans regia
This mystery has been solved. Volgmayr & Jaklitsch have described it as a new species: Juglanconis appendiculata, Persoonia 38: 144 (2017).
Many thanks to Hermann
Gernot Friebes, 20-01-2017 19:03
Re : Diaporthale on Juglans regia
It's nice to have a name for this beautiful fungus. Thanks for keeping us updated!

Best wishes,
Gernot