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31-07-2021 20:39

Stefan Jakobsson

On the verge of a forest rivulet I found an Ombrop

30-07-2021 17:18

Elisabeth Stöckli

Bonjour, Sur branche morte de Frangula alnus (Bét

31-07-2021 23:33

Wilhelm Guggisberg Wilhelm Guggisberg

This 20 um, barreled shape, beer keg-like ascospor

01-08-2021 10:00


Bonjour à toutes et à tous,Un ami m'envoie ces d

22-06-2021 01:00

Viktorie Halasu Viktorie Halasu

Dear friends,I'm looking for recent material of Ru

29-07-2021 23:25

Ethan Crenson

Hi all, This is a parasite I found on fruiting bo

31-07-2021 12:42

Edvin Johannesen Edvin Johannesen

These less than 1 mm apos were growing on Salix ca

30-07-2021 18:42

Franz Berger Franz Berger

I am searching for an appropriate genus (Biatorell

28-07-2021 15:26

Jennifer Fiorentino

Would be very happy to receive your opinion on thi

30-07-2021 00:01

Philippe  Larue Philippe Larue

Bonsoir à tous, Un sujet récent sur notre forum

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Pyrenopeziza-like fungus on aspen
Kosonen Timo, 18-06-2021 23:08
Kosonen Timo

Any ideas on this one? Spores ca. 14 x 3, with (0)1-3 septa. Asci with croziers and with prominent plug in Lugol's. Excipulum of elongated thick-walled cells. Hairs dark-coloured / brown with warts, but hyaline / smooth towards the apex, thick-walled. Sorry, no scale. On dead wood of Populus tremula.

  • message #69226
  • message #69226
  • message #69226
  • message #69226
Hans-Otto Baral, 19-06-2021 15:56
Hans-Otto Baral
Re : Pyrenopeziza-like fungus on aspen
Hi Timo

what is the size of the hairs? Ascus reaction is blue? Calycina-like?

Spores are septate already inside the living asci? Apos 0.3 mm diam.?

I have no idea.

Hardware Tony, 19-06-2021 21:19
Hardware Tony
Re : Pyrenopeziza-like fungus on aspen
Arachnopeziza seems to get close especially with 1-3 sepate ascospores and size, hairs can be smooth at tips but are long? IKI+?  Just a suggestion.
Kosonen Timo, 20-06-2021 21:38
Kosonen Timo
Re : Pyrenopeziza-like fungus on aspen

..on the road, several weeks of field work this year, i'll get back with measurements & better photos later next week. --Spores alone might fit Arachnopeziza yes, but otherwise not looking at Arachno at all, starting from the textura oblita. Spores mainly aseptate in the asci. Hairs maybe c. 5-7 um wide.

The apos sit tight in the substrate. I tried to pick one to make a slide and it resulted in the hymenium (+ medullary excipulum?) squeezing out of the apo like a bursting pimple... the point being that the dark-pigmented flanks - outer excipulum - forms a tight package acting almost like a separate covering structure.

Hans-Otto Baral, 20-06-2021 21:52
Hans-Otto Baral
Re : Pyrenopeziza-like fungus on aspen
5-7 µm wide hairs! This would mean they attain 100 µm in length. It looks a bit like a Fuscolachnum.