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03-10-2025 09:43

Josep Torres Josep Torres

Tiny blackish ascomata shaped like erumpent grains

02-10-2025 09:16

Josep Torres Josep Torres

Hello.Some tiny apothecia sprouting in a scattered

01-10-2025 20:16

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello,I would appreciate your opinion on this yell

01-10-2025 19:47

Philippe PELLICIER

Un parasite sur les feuilles de graminées qui for

30-09-2025 20:23

Rot Bojan

Hello!I'm asking for your opinion. I think it's an

30-09-2025 22:08

Philippe PELLICIER

Bonjour, cette Otidea de petite taille de 1-2 cm c

29-09-2025 10:59

Jean-Luc Ranger

Bonjour,  Je ne sais trop où chercher ce champi

28-09-2025 12:30

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello, this fungus nicely fits Lasiosphaeris hirsu

26-09-2025 23:41

Lieve Deceuninck Lieve Deceuninck

Bonjour members du forum. Merci d'avance pour tout

24-10-2024 14:39

Jean-Luc Ranger

Bonjour à tous,Découvert sur un terrain calcaire

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Calospora arausiaca?
Enrique Rubio, 12-04-2013 20:29
Enrique RubioHi to everibody


This fungus, collected on thin branches of Quercus robur, seems to be Calospora arausiaca (Fabre) Sacc. but do you know what's the actual status of this fungus?
In Whemeyer's Revision of Pseudovalsa....he says that could be only an inmature form of Pseudovalsa umbonata (actually Prosthecium pyriforme Jaklitsch & Voglmayr).
Close to the fruitbodys I have found acervuli and brownish conidia of perhaps their anamorphic state. Do you know if this conidia belong to the sexual state that I have found?
Could this fungus be an inmature state of Pseudovalsa longipes? 


Many thanks again
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Björn Wergen, 12-04-2013 21:27
Björn Wergen
Re : Calospora arausiaca?
Hi Enrique,

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

regards,
björn
Hans-Otto Baral, 12-04-2013 21:59
Hans-Otto Baral
Re : Calospora arausiaca?
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
Chris Yeates, 12-04-2013 23:24
Chris Yeates
Re : Calospora arausiaca?
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
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Hans-Otto Baral, 12-04-2013 23:33
Hans-Otto Baral
Re : Calospora arausiaca?
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.
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Chris Yeates, 12-04-2013 23:36
Chris Yeates
Re : Calospora arausiaca?
Hello Enrique - this may help - if you would like to see images of any particular species let me know
best wishes
Chris
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Jaklitsch Walter, 12-04-2013 23:49
Re : Calospora arausiaca?
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.

Enrique Rubio, 14-04-2013 12:35
Enrique Rubio
Re : Calospora arausiaca?
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
Jaklitsch Walter, 14-04-2013 17:54
Re : Calospora arausiaca?
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
Enrique Rubio, 14-04-2013 18:01
Enrique Rubio
Re : Calospora arausiaca?
Thanks, Walter!
chinthani senanayake, 30-09-2014 13:10
Re : Calospora arausiaca?
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
Enrique Rubio, 30-09-2014 13:16
Enrique Rubio
Re : Calospora arausiaca?

HI chinthani


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


 


Regards

chinthani senanayake, 30-09-2014 15:25
Re : Calospora arausiaca?
Thanks lot Sir, 
Did you deposit the specimen somewhere and is it posible to loan and examine.
regards
chinthani
Enrique Rubio, 30-09-2014 17:36
Enrique Rubio
Re : Calospora arausiaca?
No. Sorry. I didn't keep this material