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Calosphaeria on Carpinus betulus
Enrique Rubio, 03-03-2015 21:06
Enrique Rubio

Hi to all


I need again your help with this fungus with subcuticular multi-perithecia growing together under the bark with their long necks converging, on an small branch of Carpinus betulus. Asci clavate 20-29 x 4-5, gradually tapering to a very slender, shortly stipitate, base. Paraphyses tapering, septate, much longer than the asci.


I feel it is close to Calosphaeria microsperma Ellis & Everh. that grows on Carpinus too, but the ascospores in the diagnosis seem to be smaller and no so boomerang-shaped .


Have you a better idea?


Thanks again

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Alain GARDIENNET, 04-03-2015 05:15
Alain GARDIENNET
Re : Calosphaeria on Carpinus betulus

Hi Enrique,


Your fungus seems to be close to C. pulchella, except host which is usually Prunus for this species.


Have you read Barr - Mycologia 77 (1985) ?


Alain

Enrique Rubio, 04-03-2015 13:48
Enrique Rubio
Re : Calosphaeria on Carpinus betulus

Hi Alain


Many thanks but I don't think this fungus is C. pulchella (that the other hand seems to grow only on Prunus) because the ascospores are more allantoid, almost semicircular, and the asci are not so stipitate as show the images in the attached document. 


Thanks again

Alain GARDIENNET, 04-03-2015 14:07
Alain GARDIENNET
Re : Calosphaeria on Carpinus betulus

Yes you're right, and ascospores seem too big for C. microsperma. But between north-american species and european species we have already seen differences.


What think ?


I can't help you more.


Alain

Enrique Rubio, 04-03-2015 14:28
Enrique Rubio
Re : Calosphaeria on Carpinus betulus

I don't know, Alain. Maybe this genus seems to be poorly studied...


Thanks a lot for your help

Björn Wergen, 07-03-2015 16:26
Björn Wergen
Re : Calosphaeria on Carpinus betulus
Hello there,

I am currently working on a key to the species of this genus and I can tell you, that this is not C. microsperma and probably even not Calosphaeria, but Eutypella, which seem to have several similar species with strongly bent spores. I am not at home now, but if you have you can look into the Rappaz paper dealing with 8 spores diatrypaceen.

If you want, I can also send you the key when I am ready with it, it will take me several hours and perhaps I am ready this evening.

regars,
björn
Enrique Rubio, 08-03-2015 12:06
Enrique Rubio
Re : Calosphaeria on Carpinus betulus

Hi Björn


Really it's surprising your idea because the perithecia are free, subepidermial and no stromatic. Do you think this is an Eutypella species?


Regards 

Björn Wergen, 08-03-2015 19:00
Björn Wergen
Re : Calosphaeria on Carpinus betulus
Hi Enrique,

its still not easy to say if its Calosphaeria or not, but after working with this genus there is only one species having an ascus tip like Eutypella species (C. dryina, which is probably not uncommon on Quercus, but looks quite different). Can you test the ascus in congo to see if the apparat is congophil? And probably also in IKI, perhaps something surprising happens.

regards,
björn
Alain GARDIENNET, 08-03-2015 19:48
Alain GARDIENNET
Re : Calosphaeria on Carpinus betulus

Yes,please, look at asci. They apparently don't fit with Eutypella's ones.


Alain

Enrique Rubio, 08-03-2015 20:24
Enrique Rubio
Re : Calosphaeria on Carpinus betulus
You have asci in congo red and IKI in my presentation. As you can see the asci have an small refractive apical apparatus IKI negative but not really congophilous...
Alain GARDIENNET, 08-03-2015 21:11
Alain GARDIENNET
Re : Calosphaeria on Carpinus betulus

Hi Enrique,


Yes you shew asci, sorry. And indeed they fit better with Calosphaeria than Eutypella.


Perhaps your fungus is an undescribed Calosphaeria ?


Alain

Enrique Rubio, 08-03-2015 21:21
Enrique Rubio
Re : Calosphaeria on Carpinus betulus
Hi Alain. Maybe...But I don't know why Björn thinks it is an Eutypella species....
Björn Wergen, 08-03-2015 22:43
Björn Wergen
Re : Calosphaeria on Carpinus betulus
Ah sorry, I did not even recognize that it was already put in congo and IKI, it looked so...however. You do not show a full hamathecium, Calosphaeria species should also have quite short asci and very large paraphyses. Its better shown on a photo than in a description.

Or else, you can of course send me this species and I will compare it with all my other Calosphaeria collections.

regards,
björn
Enrique Rubio, 09-03-2015 13:27
Enrique Rubio
Re : Calosphaeria on Carpinus betulus
Sorry. I forgot this picture of the large, septate and acuminate, paraphyses.
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