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03-11-2024 17:36

B Shelbourne B Shelbourne

• Macro and habitat suggest Hymenoscyphus s.l.,

03-11-2024 07:27

Juuso Äikäs

This tiny (0.2 mm wide) brown cup fungus was growi

02-11-2024 16:34

B Shelbourne B Shelbourne

• Host suggests Sawadaea bicornis or Phyllactini

01-11-2024 14:54

Rot Bojan

Can someone tell me more about this mushroom pleas

31-10-2024 22:25

Karen Poulsen

Hello, On half weathered Betula leaf, I noticed t

31-10-2024 21:42

Karen Poulsen

Hello, On last year's pine needles on the ground

31-10-2024 04:07

Francois Guay Francois Guay

Last week, I found what appears to be an Amicodisc

28-10-2024 17:51

B Shelbourne B Shelbourne

• Macro and habitat suggest Hymenoscyphus s.l.,

24-10-2024 23:07

Patrice TANCHAUD

Bonsoir, récolte réalisée sous hêtres et chê

28-10-2024 23:30

Marc Detollenaere Marc Detollenaere

Dear Forum,I found some small fruit bodies of abou

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At a loss: Coprotus ochraceus????
Maria Plekkenpol, 13-10-2024 09:31
Hello, I hope someone can help :). On dung of (wild) cow were these clustered asco's, bright yellow. Mature up to 1-1,5 mm, it takes them a lot of time to release spores.
Asci narrowly cylindric and long: 200-218 x 11-15. Croziers +, IKI -. Paraphyses about the same length, enlarged apex up to 6µ. Rather hyaline to my suprise, just a little pale yellowish. 
Excipulum textura angularis-globulosa. 
Spores quite large, av 20,9 x 10, Q=2,08. Narrowly ellipsoid, smooth, hyaline and cyanophilous. Normally I see de Bary bubbles clearly but this time not quite so. I think they have them, but am not sure? Eliminating a lot, the only thing that comes close as far as I can see is Coprotus ochraceus. But some features differ (a bit) from literature: size of spores, paraphyses and length of asci.
What do you think? Again: thanks in advance!
Greetings, Maria
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Michel Delpont, 13-10-2024 17:29
Michel Delpont
Re : At a loss: Coprotus ochraceus????
Hello Maria.

I am not sure that your mushroom is a Coprotus, moreover it does not seem ripe enough. Maybe you could wait a little longer so that you can also make a preparation in the Cotton Blue with ejected spores.


Michel.

Maria Plekkenpol, 13-10-2024 18:45
Re : At a loss: Coprotus ochraceus????
Hello Michel,
First: thanks for your help! I am an absolute amateur in mycology, but I have seen de Bary bubbles: they are visible even in the asci. I include a photo of a released spore in CB: no de Bary bubble to be seen. So it must be a clear visible nucleus that I see, but not a de Bary bubble.
I am really absolutely at a loss with this one: it's not Cheilymenia, not Byssonectria, not Lasiobolus, I don't think its Thecotheus .... This is a bright yellow asco, quite large, taking forever to 'ripe'. The photo of the spores I included earlier was from one ripe ascocarp.
Do you have an idea of what it could be?
Greetings, Maria
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Michel Delpont, 13-10-2024 20:04
Michel Delpont
Re : At a loss: Coprotus ochraceus????
Bonsoir.

Yes, myco is not always obvious and it is not uncommon to find species that cause problems.

Your last photo of spores in the blue seems to show a yellowish reaction inside that could point to Cheilymenia.

I think you still have to wait for more maturity. It is in no way a Lasiobolus or a Thecotheus.

Michel.
Maria Plekkenpol, 14-10-2024 18:19
Re : At a loss: Coprotus ochraceus????
Hello Michel,
I will do that and thanks for all your help!

Greetings, Maria
Maria Plekkenpol, 19-10-2024 18:43
Re : At a loss: Coprotus ochraceus????
Hello Michel (and/or others),
I waited as you adviced me and with that, I was able to get mature spores in CB.
As you see, the spores have delicate and fine reticulation.
So thank you for your pointer towards Cheilymenia!
Seeing the fact that there are no hairs my question now is: is it C. granulata with strangely pale paraphyses and larger spores or could it be C. crassistriata? I saw the post of Lieve Deceuninck (2020) and she also speakes of yellow (instead of orange/orangish) apothecia and paraphyses with a pale apex. Also, I get the impression that the spores of C. granulata are somewhat smaller than those of C. crassistriata. On the other hand it seems that the reticulation on the spores of C. crassistriatis is less fine and delicate than on spores of C. granulata.
With this, is it possible to come to a determination? If not, I will accept my defeat :) :).
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Michel Delpont, 19-10-2024 20:41
Michel Delpont
Re : At a loss: Coprotus ochraceus????
Good evening Maria.

Your photos confirm what I thought. The ornamentation of the spores of C.Crassistriata does not seem to me to be suitable, but it is true that I know this species very little. What also distances it from C.crassistriata is the width of the paraphyses, very thin on this species. On the other hand, you do not speak of hairs either; on this species there are normally lateral hyphoid hairs.
Several varieties of C.granulata have been described in particular by J.Moravec; perhaps you could look in that direction, but without conviction on my part.
Does anyone have another idea?


Michel.

Nicolas VAN VOOREN, 20-10-2024 09:34
Nicolas VAN VOOREN
Re : At a loss: Coprotus ochraceus????
Loot at C. granulata var. elaphorum
Michel Delpont, 20-10-2024 09:56
Michel Delpont
Re : At a loss: Coprotus ochraceus????
Salut Nicolas.

J'avais effectivement pensé aussi à C.elaphorum, mais je trouve ces variétées de C.granulata plutôt délicates et variables, comme d'ailleurs pour les spores où Maria donne des tailles plus élévées.

Bon dimanche.

Michel.

Hi Nicolas.

I had indeed also thought of C.elaphorum, but I find these varieties of C.granulata rather delicate and variable, as for the spores where Maria gives higher sizes.
Have a good Sunday.

Michel.
Maria Plekkenpol, 20-10-2024 10:51
Re : At a loss: Coprotus ochraceus????
Thank you both very much for your time and help!
Better luck next time :) 

Greetings, Maria