Hi Bjorn,
did you consider Discostroma or Lepteutypa? In those genera the amyloid reaction of the apical ring may be difficult to make out. Discostroma has such striate ascospores in cylindrical asci but the beaked ascomata do not fit well. Something tricky anyway.
Cheers,
Jacques

Hi Jacques,

I think that the apical structure of the asci is definitely another typ as usual in Lepteutypa or Discostroma. Nevertheless, I checked both genera and didn't find any matching species at all (spore sizes or substrates very different).

I think it has something to do with Diaporthales in a further sense, probably one of the genera which have incertae sedis status.

regards,
björn

Yes Bjorn,
you are probably right. Good luck!
Jacques

Hi friends,

I've got all your ideas (including Jacques'one) and finally my conclusion also is that this fungus should be a Diaporthale.

In Diaporthale, one fungus has the same ascospores : Phragmoporthe conformis.
Björn, are you completly sure of Quercus ? Couldn't it be Alnus ?


But some features are not verified : clypeus is lacking, and apical apparatus is too small. Thus, it looks like a Pseudovalsa.  
Alain

Hi Alain,

Phragmoporthe conformis is completely different, with other ascus sizes, apical apparatus and a "Ditopella ditopa-appearance", which has made me insane...

I also think its something in Pseudovalsa. But it can also be completely wrong anyway.

Its definitely Quercus.

regards,
björn

Of course, Prosthecium innesii = P. platanoidis is microscopically similar, but macroscopically very very different. Look also on my page for all these species, I have found many of them. THIS one is not P. platanoidis, I am very sure.

Look also at the appendages of P. platanoidis.

I think there is no ectostroma...the species is not valsoid, perithecia seem to grow under the surface in random arrangement, tending to cluster.

Yes, I didn't realize that innesii= platanoidis, so,  it's indeed very different, I confirm that you're right.
I've no solution, sorry.
Alain

What's up Alain? You always have good ideas, come on :P

A new species? Walter should look at it...

Hi,
I had a short discussion with Martina, because the ascospores resemble those of several genera she is studying. We agree with Jacques that it is tricky. My first impression of the horizontal section, and this is also in accordance with Jacques,  was that of a xylarialean fungus. One of the problems here is that the images do not show an ascus base nor whole paraphyses. It is also not clear whether the fungus is stromatic or not, the perithecia are possibly just randomly aggregated. Is there a clypeus? Do the asci become detached and float free? Does not seem like. Also the paraphyses seem to be narrow and persistent. I would therefore rather exclude the Diaporthales. Also the ecology (many algal cells present) rather points to Xylariales.

Björn: as written in a mail - and I want to write this here for all collectors as a general wish: if you collect, collect a lot of material, not just tiny little bits, because in the latter case the material is useless and a waste of time, energy and money, if interesting but not sufficient for decent morphology, esp. illustrations. So, please send me the material, if it is not scant, e.g. just consisting of the cut perithecia.
Regards,
Walter

Hi Walter,

ok, thank you for the replay. I did not collect the material, its from Austria (R. Moosbeckhofer, Wien). I have found this one on only one twig, but there are lots more than only the showed perithecia.

Of course I can send you the material.

regards,
björn