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

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

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

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

Thanks a lot for your help

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

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 

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

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

Alain

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...

Hi Enrique,

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

Perhaps your fungus is an undescribed Calosphaeria ?

Alain

Hi Alain. Maybe...But I don't know why Björn thinks it is an Eutypella species....

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

Sorry. I forgot this picture of the large, septate and acuminate, paraphyses.