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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

08-03-2026 14:05

Helvella lacunosa
Thierry Blondelle Thierry Blondelle

Bonjour à tous,Sur 3 récoltes supposées de H. l

07-03-2026 22:22

Volutella?
Josep Torres Josep Torres

Hello.Some very tiny conidiomes collected in the D

06-03-2026 17:51

Orbilia?
William Slosse William Slosse

Good evening all,On March 4, 2026, I found the fol

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Strong KOH+ yellow reaction in Peziza
Perz Piotr, 19-09-2006 00:02
Hi,

I have collected this species, and amyloid ascus apex tells me, this is Peziza (Peziza atrospora ??).
I does not have experience with this Peziza and three things are strange for me.

1. Hymenium is coverered by red/brown/purpur gel, KOH- and IKI-
2. On ectal excipulum are hyaline, thin-walled, smooth, 0-2 septate hairs, 50-100µm x 5-12µm, some with hyaline gelatinous exsudate.
3. Here is very strong, for a long time KOH+ reaction. When added KOH the whole excipulum, medulla und hymenium going strong yellow (like paraphyses in Mollisia rosae).

Is this KOH reaction normall for this (or also other) Peziza ? And this gel on hymenium? And the hairs ?

best wishes
Pimpek
  • message #969
Perz Piotr, 19-09-2006 07:25
Micro 001 - Gel on hymenium
Micro 001 - Gel on hymenium

  • message #970
Perz Piotr, 19-09-2006 07:26
Re:Strong KOH+ yellow reaction in Peziza
Micro 002 - hairs

  • message #971
Perz Piotr, 19-09-2006 07:26
Re:Strong KOH+ yellow reaction in Peziza
Micro 003 - yellow KOH reaction

  • message #972
Jacques Trimbach, 19-09-2006 16:18
Re:Strong KOH+ yellow reaction in Peziza
Un Pachyella ? ? ?
Nicolas VAN VOOREN, 20-09-2006 18:48
Nicolas VAN VOOREN
Re:Strong KOH+ yellow reaction in Peziza
Pourrait-on avoir des données microscopiques plus complètes (spores notamment) ? Avec si possible un dessin car personnellement je ne distingue rien sur ces photos qui aide à la détermination...
Perz Piotr, 20-09-2006 23:20
Re:Strong KOH+ yellow reaction in Peziza
Hi Jacques & Nicolas,

Currently I'm waiting for spore print. Spores are with grob-ornamentation, w/o apiculi, with 1 or 2 rops of oil. When I have some free spores then I will make a good drawnings.

Pimpek
Perz Piotr, 23-09-2006 00:31
Re:Strong KOH+ yellow reaction in Peziza
Hi everybody,

My ?Pachyella (?Peziza) is fully fine mature and I have a lot o free, mature spores on glass :)

Here is a table in full resolution: http://wwkk.mikologia.pl/temporary/ascofrance/20060917_006.jpg
  • message #978
NC NC, 25-09-2006 15:48
Re:Strong KOH+ yellow reaction in Peziza
Certainly seems to be a Pachyella. A section through the margin is your best bet in understanding the difference between Peziza and Pachyella. See the papers by Pfister. Several species have warted ascospores.

Dick
Jacques Trimbach, 26-09-2006 19:15
Re:Strong KOH+ yellow reaction in Peziza
cf. Pachyella adnata (Berk.& Curt.) Pfister . Verifier la présence de " hyphoïd hairs" sur l'excipulum ectal, beignant dans un gel.