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24-03-2019 00:18

Joop van der Lee

Found on horse dung,Again I found apothecia (2) th

21-03-2019 11:32

Michel RIMBAUD

Bonjour,Récolté il y a quelques jours sur bois p

23-03-2019 23:36

Joop van der Lee

I am looking for the following documenttion.Chalaz

23-03-2019 20:26

Michel Delpont Michel Delpont

Bonsoir! Je suis à la recherche de cet article:

22-03-2019 16:28

Stefan Blaser

Hello everybody, I'm really at a loss with this o

22-03-2019 23:06

Joop van der Lee

Found on deer dung.Ascomata: yellow with setae gro

22-03-2019 21:41

Joop van der Lee

Found on deer dung during examination of another s

23-03-2019 16:06

Peter Thompson

Hello Everyone,I have found perithecia of a black

21-03-2019 01:15

Valencia Lopez Francisco Javier

Hola amigosAdjunto fotos macro/micro de unos Ascob

22-03-2019 13:37

Castillo Joseba Castillo Joseba

Me mandan la muestra seca de Galicia,  recolectad

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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