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18-05-2019 21:17

Django Grootmyers

Hello, I have been having trouble identifying this

22-05-2019 18:10

Thomas Læssøe

I have encountered scanty materiale of a tiny (!)

21-05-2019 18:13

Blasco Rafael Blasco Rafael

Hola, alguna idea de que genero mirar, me recuerda

20-05-2019 22:07

Ethan Crenson

In New York City on what I believe are raccoon dro

22-05-2019 16:05

Eike- Milorad Heinemann Eike- Milorad Heinemann

Hello together on saturday we found also this Mol

22-05-2019 19:05

Roger Melo Roger Melo

It looks like a composite apothecia on wood of an

21-05-2019 21:41

Eike- Milorad Heinemann Eike- Milorad Heinemann

Hello together on saturday we found this Pyrenope

22-05-2019 11:10

BERNARD CLESSE BERNARD CLESSE

Bonjour à toutes et tous,Auriez-vous une idée su

21-05-2019 22:25

Ron Bronckers

Hi everybody,Maybe someone can help me to obtain a

21-05-2019 11:21

Castillo Joseba Castillo Joseba

Me mandan el material desde Galicia,  recolectado

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Rhizodiscina lignyota?
Edvin Johannesen, 15-02-2019 20:44
Edvin Johannesen
Hi!

These black, semi-immersed/erumpent apothecioid ascomata on Salix (?) twig, have spores which strongly resemble Rhizodiscina lignyota. But the spores are too large; 20-25 x 7-9 microns.  Are we in Patellariaceae or am I totally lost?
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Hans-Otto Baral, 15-02-2019 21:12
Hans-Otto Baral
Re : Rhizodiscina lignyota?
the asci are also too slender for Rhizodiscina. Did you test IKI?
How look the paraphyses? The dead asci are very thick-walled as I see, surely they are fissitunicate.

Are the asci in perithecia, did you do a vertical section for a macrophoto?
Edvin Johannesen, 15-02-2019 21:39
Edvin Johannesen
Re : Rhizodiscina lignyota?
The second photo is a cross section. I see no perithecia or ostioles. I will check IKI and paraphyses. Thanks so far!
Edvin Johannesen, 15-02-2019 22:45
Edvin Johannesen
Re : Rhizodiscina lignyota?
The spores turn bluish green in Lugol, but I do not see any IKI+ in the asci. I am unable to see paraphyses (Congo Red). There are indeed som pale loci within the stromata, so the hymenium seems to be localised to those. But I see no opening to the outside.
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Edvin Johannesen, 15-02-2019 22:45
Edvin Johannesen
Re : Rhizodiscina lignyota?
Congo Red.
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Gernot Friebes, 16-02-2019 07:42
Re : Rhizodiscina lignyota?
Hi, Edvin,

I think you might have Dothidea sambuci there.

Best wishes,
Gernot
Hans-Otto Baral, 16-02-2019 08:32
Hans-Otto Baral
Re : Rhizodiscina lignyota?
Indeed, Gernot, it is. The species doe snot seem to be very host specicif, as I have here also a sample on Berberis? Sambucus would easily be recognised by its large pith, did you check that, Edvin?
Edvin Johannesen, 16-02-2019 11:35
Edvin Johannesen
Re : Rhizodiscina lignyota?
Indeed! There are 16 previous collections from Norway, of which seven have substrate information; six on S. nigra and one on S. racemosa. Looking at it now (should have seen it right away), this one is undoubtedly Sambucus racemosa.

Thanks a lot for your help.

Edvin