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02-07-2025 17:26

Yanick BOULANGER

BonjourRécolté sur une brindille au fond d'un fo

02-07-2025 09:32

Nicolas VAN VOOREN Nicolas VAN VOOREN

Hello, bonjour.Here is the paper I'm searching for

30-06-2025 16:56

Lydia Koelmans

Please can anyone tell me the species name of the

01-07-2025 23:37

Josep Torres Josep Torres

Hello.A Pleosporal symbiotic organism located and

30-06-2025 12:09

Edvin Johannesen Edvin Johannesen

This tiny, rather "rough" erumpent asco was found

30-06-2025 06:57

Ethan Crenson

Hi all, Another find by a friend yesterday in Bro

30-06-2025 19:05

ALAIN BOUVIER

Bonjour à toutes et à tousJe cherche à lire l'a

30-06-2025 14:45

Götz Palfner Götz Palfner

This is a quite common species on Nothofagus wood

25-06-2025 16:56

Philippe PELLICIER

Bonjour, pensez-vous que S. ceijpii soit le nom co

29-06-2025 18:11

Ethan Crenson

Hello all, A friend found this disco yesterday in

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Karstenia?
Enrique Rubio, 03-05-2019 21:38
Enrique RubioThese apothecia grew in a decorticated branch of hardwood of 10 mm thick, fallen to the ground, product of a pruning.The hymenium is dextrinoid and the ascospores are multiseptate. I think in Karstenia as a good genus for it.
What do you think?
This collection is from central Spain at 1000 m of altitude, april 6(2019).
Many thanks again
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Hans-Otto Baral, 03-05-2019 21:56
Hans-Otto Baral
Re : Karstenia?
Hi Enrique
With Karstenia I agree. It could be valuable to make a KOH-pretreatment and test in IKI or MLZ (both the same), you will get a blue hymenium (hemiamyloid, not dextrinoid!) and perhaps a small blue  apical ring becomes visible under oil immersion, depending on the species. Dextrinoid would mean red in MLZ whereas your pic clearly shows no reaction in MLZ.

Zotto
Jason Karakehian, 03-05-2019 22:11
Jason Karakehian
Re : Karstenia?
Hi Enrique, do you observe longitudinal wrinkles on the ascospores at all?
Enrique Rubio, 04-05-2019 01:18
Enrique Rubio
Re : Karstenia?
No, Jason. I haven't observed any ornamentation on the spores.
Enrique Rubio, 04-05-2019 01:46
Enrique Rubio
Re : Karstenia?
From dried, not fresh material:
*Mlz. + KOH-pret. = negative
*IKI + KOH-pret. = reddish, not blue
I haven't observed any bluish apical pore.
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Hans-Otto Baral, 04-05-2019 08:37
Hans-Otto Baral
Re : Karstenia?
Sorry, but your KOH pretreatment must have been very weak. I cannot imagine that an ostropalen fungus does not turn to an I-blue reaction even if exposed to 1-2% KOH for a few seconds only.