Hi Enrique,

quite interesting finding, I think this is C. arausiaca, but I do not know anything about the anamorph.

regards,
björn

I know these conidia as Helminthosporium velutinum. Is it the anamorph of Letendraea helminthicola or only the host of the Letendraea (see Boudier pl. 580)? Is it  the anamorph of Chaetosphaeria as the IF pretends?

The Ana-Teleo database gives instead four further genera as teleomorph of Helminthosporium.

Zotto

With respect to Zotto; in my opinion this is not Helminthosporium (see image); Enrique specifically mentions acervuli and I think these are conidia of a Coryneum (Diaporthales) and therefore quite possibly a Pseudovalsa anamorph.
amitiés
Chris

Yes, you are right Chris, I was surprised about the very strong similarity, the identical distosepta, and also the striate structure in the wall of the conidia. They look perfectly the same. When they are actually formed inside acervuli they cannot be the same.

Hello Enrique - this may help - if you would like to see images of any particular species let me know
best wishes
Chris

Pseudovalsa longipes + Coryneum anamorph
Cheers, Walter

By the way, Enrique, you seem to mix up 2 things:
Pseudovalsa umbonata (Quercus!) is quite different from Prosthecium pyriforme (Acer!). P. umbonata has usually well-defined dark stromata, similar to P. lanciformis (Betula). P. longipes or e.g. P. modonia (Castanea) have weakly developed stromata. P. modonia has 1-septate spores but is still a Pseudovalsa. Important is the Coryneum anamorph. I did not believe it, but cultured from both ascospores and conidia. Sequences were identical !
P. longipes is variable, but has typically 3-5 septate ascospores. It seems to develop slowly and you find often immature asci. This species may co-occur with P. umbonata and often the Coryneum states (or teleomorph of one, anamorph of the other species) are mixed on the same twigs. Usually P. umbonata is more common than P. longipes, at least in Austria.

Thanks a lot to all!


So, Calospora arausiaca is a phantom species, only an inmature state of Pseudovalsa longipes? 
Has somebody images of mature ascospores of Pseudovalsa longipes?


Thanks in advance

well, we simply do not know what Calospora arausiaca is. Fabre described it as Pseudovalsa with (1-)3 septate hyaline spores. It could be an immature stage of P. longipes (or P. umbonata??), but in both cases it is a later synonym. Neither Berlese illustrated it, nor did Wehmeyer receive type material, therefore it is likely that there is no type. We currently do not work on Pseudovalsa, i.e. we did not try to trace it.
Best wishes, Walter

Thanks, Walter!

Hello Sir,
Do you have the pure culture of  Calospora arausiaca. I have collected a fungi looks same with this. if you have the culture, I can study further to resolve this.
thanks lot
chinthani

HI chinthani

I'm sorry but I didn't preserve, nor cultured, this fungus

 

Regards

Thanks lot Sir, 
Did you deposit the specimen somewhere and is it posible to loan and examine.
regards
chinthani

No. Sorry. I didn't keep this material