spores (scale=10 µm)

asci (scale=10 µm)

Hallo Gernot,

hast Du es mal bei mal Helminthosphaeria probiert?
http://www.cybertruffle.org.uk/cyberliber/59350/0089/001/0141.htm

Herzlich

Martin

Hi Martin,

thank you but Helmintosphaeria should have setae which my find doesn't have. Also, I don't think that species in Helmintosphaeria form such long ostioles but maybe I'm wrong.

Best wishes,

Gernot

Hi gernot,
I think your fungus belongs to Ceratostomella as revised by Réblova in 2006 (Mycologia 98). The immersed, long beaked ascomata and one-celled grey brown ascospores fit well the genus.
Ceratostomella pyrenaica occurs on wood and on old polypores as well, but its spores are more slender and differently shaped.
Ceratostomella rhynchophora is also a possible match but its spores are a bit shorter and have a minute pore at both ends. You should come back to your fungus and check whether it fits any of those two species.
Good luck!
Jacques

Hello Gernot,
due to your posting and Jacques' reference to the article by Reblova I remembered a find I made in 2008 at Berlin (Plänter Wald) which is until now not determinated. Unfortunately, I have no material of this find. Therefore I had only some sparse notes and a few (very) bad microphotos and a bad drawing inside the microphoto (see below).
Here are my data:
Spores light brown to light greybrown, small elliptical, in side view sligthly curved, 7-9 x 2,5-3 µm, with two or three oildrops (in IKI with a very slightly amyloid reaction)
Asci 35-40 x 8-10 µm, IKI-
Texture and “hairs” not examined.
Substrate: on old, wet and rotten Trametes gibbosa (at Fagus sylvatica). Trametes gibbosa is blueing in some areas (due to this fungus?).
If I study the article by Reblova, it takes me to Ceratostomella pyrenaica. Can it be possible? What do you think, Jacques?
Best, Uwe

macro2

micro
sorry for the bad photos!

Hi Uwe,
I agree with you this is much like C. pyrenaica. Your photos, even not very sharp, illustrate well the different shape of spores as compared with Gernot's ones.
Gernot, at least you know what your fungus is not!
Jacques

Hi Jacques and Uwe,

sure, Ceratostomella! Thanks, I totally forgot about this genus. But now it's difficult because C. pyrenaica clearly is a different species and C. rhynchophora should have shorter spores. Except of the size of the spores everything fits for C. rhynchophora, I think I have even seen the pores at the end of some spores. Very interesting...

Best wishes and thanks again,

Gernot

Hi Gernot,
thank you for your posting!
Hi Jacques,
thank you for your confirmation!
Best, Uwe

Hi friends,
Have you looked around the genus Xylomelasma ?
Jacques, you know X. sordida, I believe ? Is it possible ?
Alain

Hi Alain,

thank you very much for your suggestion, I think that Xylomelasma sordida fits even better to my fungus than C. rhynchophora in size of ascospores, big oil drop inside the spores and arrangement in the ascus.

Best wishes,

Gernot

I fully agree with Alain, Xylomelasma is a much better match because of the cylindric asci with uniseriate spores, as it is well illustrated in Gernot's photos, and X. sordida very plausible, though the substrate is unusual.
Great forum !
Jacques

Yes, thank you very much, Alain and Jacques! Also the size of the spores and the big oil drop inside them fit better for Xylomelasma according to Réblova's work. It is very interesting to see how these species can grow both on wood and old polypores.

Best wishes,

Gernot

Yes, thank you very much, Alain and Jacques! Also the size of the spores and the big oil drop inside them fit better for Xylomelasma according to Réblova's work. It is very interesting to see how these species can grow both on wood and old polypores.

Best wishes,

Gernot