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05-06-2022 02:07

Micropeziza(?) on Chamaenerion
Stefan Jakobsson

On an old stem of Chamaenerion angustifolium on th

06-06-2022 10:34

Ascomycete with brown septate spores
Jennifer Fiorentino

When examining the apothecia of an arthonoid liche

05-06-2022 19:17

Thelebolus microsporus?
Maria Plekkenpol Maria Plekkenpol

Hello,On cow dung I found several asco's. One of t

03-06-2022 23:11

Small Lachnum on Filipendula ulmaria
Sergey Markov

I found small Lachnum on a stem of Filipendula ulm

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Asco without hair?
Mirek Gryc

Hello.The asco grew on the escarpment of the fores

03-05-2022 16:17

Discomiceto sobre cono
Josep Torres Josep Torres

Hola.Unos diminutos apotecios sobre la superficie

05-06-2022 10:40

Literature request - 4-spored Saccobolus
Nicolas VAN VOOREN Nicolas VAN VOOREN

Dear all,Is there anyone has the following paper:D

04-06-2022 09:30

Literature request
Bernard Declercq Bernard Declercq

Dear all,I am looking for following paper:K. Hanse

04-06-2022 12:23

White asco on the cortex of Prunus spinosa?
Mirek Gryc

HelloI would ask for help in identifying this litt

25-05-2022 13:07

Black with Helianthus tuberosus?
Mirek Gryc

Hello allPerithecia grew on Helianthus tuberosus.

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Micropeziza(?) on Chamaenerion
Stefan Jakobsson, 05-06-2022 02:07
On an old stem of Chamaenerion angustifolium on the ground I found a swarm of small brown disks together with many other discomycetes.

The disks are sessile, 80-200 µm wide, with a darker slightly raised margin. The exciple is covered with a crust covering everything and preventing a view of what is behind. A similar crust is in part also covering the hymenium (pseudoepithecium?). Asci eight-spored, 32-55 × 5.9-7.3 µm, the bases are so agglutinated that I dont't know about croziers, negative in Lugol with and without pretreatment. The spores are 7.0-8.0 × 2.6-2.9 µm, with a few small guttules at each end. The parafyses are slighly clavate, 3.0-4.2 µm at apex and unfortunately so easily dying that I can't say anything about their contents.


I can't find a Micropeziza with such small spores - or is it something else?

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Hans-Otto Baral, 05-06-2022 11:07
Hans-Otto Baral
Re : Micropeziza(?) on Chamaenerion
Good docu! Micropeziza has very striking VBs in the living paraphyses (in the apex). I am not sure if you saw living paraphyses here. I would check with KOH if the pigment gets dissolved.

In my Cordieritidaceae folder, subfolder "Skyttea = Durella redbrown", might be similar species, but they show the ionomidotic recation and I never saw them on herbs.
Stefan Jakobsson, 06-06-2022 01:18
Re : Micropeziza(?) on Chamaenerion
I added KOH to a water mount but I could observe no dissolving pigments.

But I think I found some living parafyses. They have a not very refractive guttule at the apex. They are very sensitive to pressure - as soon as I touch the cover slip they are mostly gone.


The crust of my fungus is very similar to the the one on photo "Durella, II.2014-2" in the Skyttea folder.

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Hans-Otto Baral, 06-06-2022 09:30
Hans-Otto Baral
Re : Micropeziza(?) on Chamaenerion
This all looks indeed like a Micropeziza, but I wonder why these VBs in the paraphysis apices are angular, not roundish. Maybe they are already distorted?

This is actually the same species as you have pointed out:

"Javier Balda: I found this on "dry Angelica still standing" croziers - IKI -". I am not sure with the absent croziers, but it could be. Did you make up your mind regarding croziers?

I put the two in a folder "Angelica + Chamaenerion" but fear they are misplaced in Cordieritidaceae.
Stefan Jakobsson, 06-06-2022 19:56
Re : Micropeziza(?) on Chamaenerion
I made another attempt to find croziers and the result is that I am about 55 percent sure there are croziers. When applying some pressure on the preparation to make it thinner the result is that most old asci break just below the last spore. Young asci never get clearly visible.

Thank you, I suppose this is as far as it is possible to get with morphology alone.

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Hans-Otto Baral, 06-06-2022 21:22
Hans-Otto Baral
Re : Micropeziza(?) on Chamaenerion
On the right picture it is clearly withput croziers (in case these are ascus bases). A possibility is that some asci have protuberances which do not rejoin. Complete croziers are required in order to be sure.