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17-09-2024 17:33

Pierre-Yves Julien

Récolte le 03/09/2024 lors de la Session Zone Alp

17-09-2024 15:31

Bernard Declercq Bernard Declercq

Hello,I am looking for following paper:IMI Descrip

17-09-2024 02:12

B Shelbourne B Shelbourne

• Macro and habitat seems like Hymenoscyphus s.l

16-09-2024 14:20

Elisabeth Stöckli

Bonjour,Sur une pierre recouverte de mousse (forê

06-09-2024 16:23

Andgelo Mombert Andgelo Mombert

Bonjour,J'ai trouvé cette semaine Caesiodiscus po

15-09-2024 12:51

B Shelbourne B Shelbourne

• Macro and habitat suggest Cyathicula.• Confi

08-10-2019 21:31

Jason Karakehian Jason Karakehian

Hi AscoFrance community, Does anyone have a PDF

08-09-2024 21:31

B Shelbourne B Shelbourne

• Stromatised substrate and macro like genus Rut

14-09-2024 01:12

B Shelbourne B Shelbourne

• Ascobolus species on wild herbivore dung.• S

13-09-2024 07:19

Thierry Blondelle Thierry Blondelle

BonjourDans le genre Trichobolus, quelles sont les

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Hyphodiscus or Cistella?
Uwe Lindemann, 14-11-2009 01:37
Uwe LindemannHello Forum,
I recently found a little discomycet which I can't determine.
Macroscopic features:
Apothecia gregarious, sessile; Disc 0,1-0,3 mm, young pale beige, old greyish and brownish with a greenish tint (see photos)
Microscopic features:
Asci arising from croziers, 8spored, 45-55 x 6-7 µm, mostly biserate, IKI- and MLZ- !
Spores ellipsoid, hyaline, aseptate, with two polar guttules and/or some small guttules, 6-7,3(9) x 2,7-3(3,5) µm
Paraphyses filiform, 2 µm wide, sometimes slightly thickened at the apex
Hairs hyaline, thin to thick walled, coarsely warted, up to 5 µm wide; in some areas of the excipulum they are yellowish caused by a yellowish "exudate" which covered the outside of the excipulum.
Ectale excipulum: textura prismatica, mostly getalinous
It grows on Rubus.
My first guess is Hyphodiscus hymeniophilus but the size of the spores and the substrate are not fitting well.
What do you think about it? I would be very happy if you can help me!
Best Uwe
  • message #9536
Uwe Lindemann, 14-11-2009 01:38
Uwe Lindemann
Re:Hyphodiscus or Cistella?
Makro2
  • message #9537
Uwe Lindemann, 14-11-2009 01:38
Uwe Lindemann
Re:Hyphodiscus or Cistella?
Mikro
  • message #9538
Hans-Otto Baral, 14-11-2009 10:05
Hans-Otto Baral
Re:Hyphodiscus or Cistella?
Hi Uwe

this is 100% a Hyphodiscus, because of brownish colour and yellow exudate (which is onoly inconsistently present in Hyphodiscus but never in Cistella). The strongly gelatinized excipulum is also typica.

I would also say H. hymeniophilus, spore size , shape and gutules would fit quite well. But if you are right that the asci are inamyloid (in Lugol) then this would be the first time. I suggest you try pretretment with KOH and then test IKI or MLZ again. Hyphodisci are often hemiamyloid, so a clear blue is only obtained after KOH, and the IKI-red reaction sometimes overlooked.

My only collection with sch elongate spores and inamyloid asci was on Alnus viridis. Regrettably it was in bad shape, so I had no free spores:

H. cf. hymeniophilus. Asci IKI-/K+IKI-. Sp. *5-6(-8) x 2-2.2 µm, Ölm.1: 2-3 minute LBs in each end.

Was it Rubus idaeus or fruticosus-group?

Zotto
  • message #9539
Uwe Lindemann, 14-11-2009 11:02
Uwe Lindemann
Re:Hyphodiscus or Cistella?
Hi Zotto,
yes, the porus is hemiamyloid! After the pretreatment with KOH I can see the IKI-reaction (blue) very well. Thank you for your help!
An the substrate is of the rubus fruticosus-group (Brombeere).
All my best,
Uwe