Accès membres

Mot de passe perdu? S'inscrire

13-10-2025 19:05

Louis DENY

Bonjour forumSur tronc décortiqué de feuillu x,

17-02-2013 21:11

Peter Welt Peter Welt

Jamoni, P.G. 1998. Un nuovo discomicete coprofilo

11-10-2025 20:27

Marcel Heyligen Marcel Heyligen

Found on a barked branch, 14 mm in diameter, of Ro

11-10-2025 14:20

Jean-Luc Ranger

bonjour à tous, Je ne vois pas comment l'on peut

09-10-2025 22:14

S. Rebecca

We just had the Bavarian Mycology Conference in Au

10-10-2025 00:49

Ethan Crenson

Hello all, This was found last weekend on a hardw

06-10-2025 15:57

David Chapados David Chapados

Hi, Could anyone help me with this Lophiostoma? 

04-10-2025 02:13

Francois Guay Francois Guay

Hi everyone,   I found this Hymenoscyphus growi

03-10-2025 22:17

Francois Guay Francois Guay

Hi everyone,   I found this white, star-shaped

03-10-2025 22:03

Francois Guay Francois Guay

Hi everyone, I found this weird asco growing on wo

« < 1 2 3 4 5 > »
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