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28-11-2020 19:54

Blasco Rafael Blasco Rafael

Hola, He recogido este Hypoxylon creo puede ser ru

24-11-2020 14:46

Thomas Læssøe

see: https://svampe.databasen.org/observations/101

28-11-2020 17:00

Edvin Johannesen Edvin Johannesen

Apothecia short-stipitate, pale yellow, 2-5 mm, or

26-11-2020 16:17

Blasco Rafael Blasco Rafael

Hola,  Alguno de Ustedes tiene documentación o a

27-11-2020 11:34

DirkW DirkW

salut a tous,on dead stem of indet. herbaceous pla

27-11-2020 16:48

Andgelo Mombert Andgelo Mombert

Bonsoir, Je suis intéressé par de la documentat

26-11-2020 17:58

Gérard MELARD

Bonjour à chacune et à chacun,Je vous soumets un

27-11-2020 11:16

Joaquin Martin

Hi,I found this little ascomycete on rubus, I thin

11-02-2017 13:39

Nihad Omerovic

Hello,Loking for confirmation or opinions on this

26-11-2020 20:43

Marek Capoun Marek Capoun

Hello everybody, I need help with the determinatio

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Pyrenopeziza on Populus bark?
Mirek Gryc, 19-11-2020 20:23

The fruiting bodies are very small, 0.4 mm maximum.
However, I am not sure if the fruiting bodies actually grew on the bark. The thallus of a dead lichen was visible on the bark where they appeared. Apparently, it was the place where fruiting bodies were growing.

The fruiting bodies are so small and fragile that I am not able to make an exact cross-section.
Do you have any ideas?
best regards
Mirek

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Hans-Otto Baral, 19-11-2020 20:36
Hans-Otto Baral
Re : Pyrenopeziza on Populus bark?
Could be a Hyphodiscus. How is the excipulum? I guess not angularis?
Mirek Gryc, 19-11-2020 20:50
Re : Pyrenopeziza on Populus bark?
Hi Zotto
The problem is that I cannot observe the structures. The fruiting bodies are very delicate and thin. But if there were angularis, I would probably notice?
It keeps them alive so I'll try to observe something more, but with my ever weaker eyesight I have problems with it.
Thank you .
Mirek
Mirek Gryc, 20-11-2020 16:15
Re : Pyrenopeziza on Populus bark?
Hi Zotto
Only today I had time to see the find in daylight. What appeared to be a dead lichen is not. The fruiting bodies grow on the dead piece of Peniophora. Peniophora has not been microscoped, but the macro features indicate Peniophora polygonia, which in my case is a common species on Populus tremelia.
You were right it was Hyphodiskus but I am not able to match it with any collection you have on disk.
The vast majority of spores without any content. Only very rarely can you find spores with two small droplets. I have measured more spores, here are their dimensions:
(5.5) 5.9 - 8 (9.6) × (1.7) 1.9 - 2.2 (2.3) µm
Q = (2.6) 2.8 - 3.9 (5); N = 18
Me = 6.9 × 2.1 µm; Qe = 3.4
For the sake of completeness, I also put in a few more photos.
best regards
Mirek
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Hans-Otto Baral, 20-11-2020 17:10
Hans-Otto Baral
Re : Pyrenopeziza on Populus bark?
Yea, it is a Hyphodiscus. The excipulum is hyaline and strongly gelatinized.

The type of Hyphodiscus, H. theiodeus, grows also on Peniophora but has globose spores.

Species with spores like yours are difficult. Compare H. hymeniophilus and some others in my folders.

A red stain to the substrate is typical of H. hymeniophilus amd a yellow exudate on the hairs to some others.

Zotto