White ASCO on wood Populus? - Forum ASCOFrance

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White ASCO on wood Populus?

Mirek Gryc, 01-02-2020 10:26

Hi
Fruiting bodies growing on a branch of dead Populus, almost completely devoid of bark. Up to 1 mm.
Spores in ascus no septate.

Zotto: some time ago I sent you photos of a very similar collection, also from Populus.
In this case, the sporocarps were very mature. It was difficult to make good documentation. I could not observe any reaction to Lugol.
Now it seems to me that it is the same species but fruiting bodies younger and in better condition.

Thank you in advance for your help!
Mirek

Andreas Gminder, 01-02-2020 11:37

Re : White ASCO on wood Populus?

Hello,

I have no idea, but the foto of the ascus pore in Lugol shows a dirty red reaction in my opinion.

all the best,
Andreas

Mirek Gryc, 01-02-2020 11:50

Re : White ASCO on wood Populus?

Hi Andreas

Despite the fact that I personally watched at least a dozen Ascus under a microscope, I could not decide what porus reaction :)
Therefore, without comment, I posted a photo counting on your opinion.

Below are more photos showing porus reaction.
The second photo shows the same, but after sharpening the maximum colors.

Mirek

Andreas Gminder, 01-02-2020 11:56

Re : White ASCO on wood Populus?

Hello Mirek,

definitely a positive porus reaction, and according to the terminology that Zotto uses I would name that "IKI rb"

best,
Andreas

Mirek Gryc, 01-02-2020 12:42

Re : White ASCO on wood Populus?

Thank you Andreas.
Last December, I found microscopically very similar, as I also wrote on Populus. The sporocarps were heavily ripe and frozen. I wanted to make some extra documentation, but after two at home, their structures were completely destroyed :(
Compared to those presented now, a few differences can be easily seen, although the overall structure was very similar.
- the spores were slightly wider.
- negative porus reaction
- 1-septate spores in ascus
Upload their photos below!
Regards
Mirek

Hans-Otto Baral, 02-02-2020 11:17

Re : White ASCO on wood Populus?

Hi both

sorry, I overlooked this thread. Hmm, no idea. Possible there are elongated VBs in the paraphyses but I am not sure.

A Pyrenopeziza perhaps? There are some on wood. But the excipulum is nowhere angularis? I think it is, on your fifth pic I see isodiametrical cells though rather hyaline.

Zotto

Mirek Gryc, 02-02-2020 15:44

Re : White ASCO on wood Populus?

Hi Zotto
I think you are right as always. Paraphyses contain elongated VBs, with contents weakly refracting light.
Excipulum is very illegible but it has oval cells (angularis).

I suspect that finding younger fruitbodies would help in observation. The ones I microscoped were quite difficult :(

Thank you
Mirek

Hans-Otto Baral, 02-02-2020 16:14

Re : White ASCO on wood Populus?

In any case, nothing fits in my Pyrenopeziza on wood subfolders.

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