Accès membres

Mot de passe perdu? S'inscrire

17-07-2025 11:55

Una para ID 833
Castillo Joseba Castillo Joseba

De ayer en bosque de hayas y abetos, en tieraEjemp

16-07-2025 17:34

Sphaerulina cornicola versus Septoria cornina
Bernard Declercq Bernard Declercq

Hello,I have trouble distinguishing above mention

14-07-2025 11:20

Une hélotiale sur Sphagnum palustre
Michel Hairaud Michel Hairaud

Bonjour, Voici une espèce de  (?) Hyaloscyphace

15-07-2025 13:27

literature request
Angel Pintos Angel Pintos

Hello, does anyone have access to the following ar

16-01-2023 21:31

Troposporella fumosum => Troposporella monilipes
Riet van Oosten Riet van Oosten

Hello, Nearby the find of Calycina claroflava on

14-07-2025 17:55

Hypoxylon cf ticinense
Yanick BOULANGER

BonjourAutre dossier laissé en suspendJe viens de

14-07-2025 11:17

Jackrogersella minutella VS Hypoxylon cohaerens var. microsporum
Yanick BOULANGER

BonjourJ'ai un dossier Jackrogersella qui est rest

14-07-2025 15:52

Olla aff. millepunctata (croziers +) on Rubus idaeus
Gernot Friebes

Hi,I wanted to share this collection on Rubus idae

14-07-2025 13:37

Rutstroemia ulmariae(?) on Saxifraga rotundifolia
Gernot Friebes

Hi,do you think this collection could be R. ulmari

25-02-2023 18:36

Nectria
Elisabeth Stöckli

Bonsoir, Trouvé sur un tronc de Salix recouvert

« < 1 2 3 4 5 > »
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?
  • message #56335
  • message #56335
  • message #56335
  • message #56335
  • message #56335
  • message #56335
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.
  • message #56340
  • message #56340
  • message #56340
  • message #56340
Edvin Johannesen, 15-02-2019 22:45
Edvin Johannesen
Re : Rhizodiscina lignyota?
Congo Red.
  • message #56341
  • message #56341
  • message #56341
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