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11-03-2026 17:36

Help for Genus and Species ID
Michel Hairaud Michel Hairaud

Bonjour, Je cherche des indices  pour cette réc

09-02-2026 22:01

Sp
ruiz Jose

Hola, me paso esta colección en madera de pino, t

11-03-2026 16:48

Saccobolus minimoides ?
Bruno Coué Bruno Coué

Bonjour, je serais heureux d'avoir votre avis sur

11-03-2026 14:14

Scopinella on Dryas octopetala
Gernot Friebes

Hi,I would like to share a collection of Scopinell

15-09-2020 17:27

Thyridaria sp.
Andgelo Mombert Andgelo Mombert

Bonjour, Sur branche morte décortiquée de Berbe

10-03-2026 18:08

Orange discs on Arctium
Marc Detollenaere Marc Detollenaere

Dear Forum,On stems of Arctium, I found some downy

05-03-2026 10:07

White apothecia on pine cone
Hulda Caroline Holte

Hello, I found and collected this species growing

07-03-2026 13:06

Phaeohelotium parasulphuratus ?
éric ROMERO éric ROMERO

Bonjour tous, Sur cône d'épicea fortement imbu,

23-12-2025 08:27

Hymenoscyphus?
Josep Torres Josep Torres

Hello.Small, yellowish ascomata, with very short a

28-02-2026 11:05

Peziza
Yanick BOULANGER

Bonjour à tousLe 24/02/2026 à Montmacq, devant m

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Karstenia Idaei or K. rhopaloides?
Margot en Geert Vullings, 23-02-2024 16:26
We found these discs on the inside of loose bark of a dead Picea.
We think a Karstenia, could this be K. Idaei or K. rhopaloides?
Spores measured in water 37.6-58.38 x 2.9-3.8µ
Asci measured in water 71x12µ
Paraphyses thin cylindrical.

We tried pre-treating with KOH and staining with Lugol. The Ascus top is I+ ? Should be neg.

For Karstenia rhopaloides the spores are to thin.

We think we see periphysoids?
Thanks in advance,
Margot&Geert
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Hans-Otto Baral, 23-02-2024 17:36
Hans-Otto Baral
Re : Karstenia Idaei or K. rhopaloides?
No, but perhaps K. idaei?
Margot en Geert Vullings, 23-02-2024 18:06
Re : Karstenia Idaei or K. rhopaloides?
Hans-Otto, you mean no for the periphysoids?

Could it be K. idaei with ascus I+?
Hans-Otto Baral, 23-02-2024 20:46
Hans-Otto Baral
Re : Karstenia Idaei or K. rhopaloides?
I did not read your heading when I suggested K. idaei.

The periphysoids are pretty o.k. for Karstenia, but you are right, K. idaei I know without amyloid ring. In your specimen it is an exceptionally clearly amyloid ring.

I have not the time to check all my files so my answers are often spontaneous, I am sorry.
Margot en Geert Vullings, 24-02-2024 19:09
Re : Karstenia Idaei or K. rhopaloides?
Thank you very much and no sorry needed, we are always happy with your help.

In your paper of K. idaei on photo 7-II-2009-2 and 3  we also see an Lugol "swach" + reaction and on photo 13-VII-2008-2 also Lugol + reaction.

Kind regards, Margot&Geert
Hans-Otto Baral, 24-02-2024 20:25
Hans-Otto Baral
Re : Karstenia Idaei or K. rhopaloides?
Actually the 2008 find is strongly blue in the apical ring. It must be Enrique's images but I lost the info from where I got them in mid July 2008.

2009 is Gernot's, and I am not even sure if it has a ring.

Everything is possible: different species or variation within a species.

Zotto
Margot en Geert Vullings, 25-02-2024 18:18
Re : Karstenia Idaei or K. rhopaloides?
Thank you very much Zotto.