Pyrenomycet on wet wood - Forum ASCOFrance

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Pyrenomycet on wet wood

Gernot Friebes, 01-07-2010 11:36

Hi,

this pyrenomycet grew on a very wet piece of a stem lying next to a stream, together with Pseudohalonectria lutea, Miladina lecithina, Orbilia sarraziniana and others. The spores remind me of Kirschsteiniothelia aethiops, however, they are too big and the other characters do not fit.

The perithecia are smooth, very soft, black and +- superficial. The spores are smooth too, 32-38 x 13-14 µm big and always two-celled. I didn't observe any sheaths. The asci are +- cylindrical, 8-spored and bitunicate. Paraphyses are present. The peridium consists of brown, roundish to angular cells.

I'd be happy if you could help me. :)

Best wishes,

Gernot

perithecia:

Gernot Friebes, 01-07-2010 11:37

Re:Pyrenomycet on wet wood

micros (scale=10 µm):

Christian Lechat, 01-07-2010 12:38

Re:Pyrenomycet on wet wood

Hi gernot,
I think your fungus is Jahnula aquatica, species very common on submerged wood.
All the best ,
Christian

Gernot Friebes, 01-07-2010 14:52

Re:Pyrenomycet on wet wood

Hi Christian,

thank you very much!

Best wishes,

Gernot

Jacques Fournier, 01-07-2010 21:48

Re:Pyrenomycet on wet wood

Hi Gernot,
Jahnula aquatica is a very distinctive fungus, and your very good photos make the identification unambiguous. Great!
Jacques

Gernot Friebes, 01-07-2010 22:15

Re:Pyrenomycet on wet wood

Thank you, Jacques! I think once you have found a name for this species, you won't forget it anymore.

Best wishes,

Gernot (who is looking forward to reading your work about aquatic Ascomycota)

Till Lohmeyer, 01-07-2010 23:09

Re:Pyrenomycet on wet wood

Cher tous,

I think, I have to thank Gernot for his question and Christian for his answer ... I have a file here named "Ignota genera", containing descriptions of Ascomycetes I could not place - for lack of time or knowledge - into a particular genus. The last entrance was a personal note on ... what just turned out to be Jahnula aquatica! It was found at the end of March this year on (very) wet wood in a swampy area in South Eastern Upper Bavaria. The species seems to have escaped the attention of German mycologists for a long time, although the type locality of Amphisphaeria aquatica Kirschstein & Plöttner (1906) was in Brandenburg.

Unfortunately my collection was very scanty, so I could not make an exsicccatum. But In this case I rely on my notes which are almost identical with Gernot's.

Best regards
Till

Gernot Friebes, 01-07-2010 23:16

Re:Pyrenomycet on wet wood

Hi Till,

it's always a nice feeling if you find something indeterminable and after some time somebody shows it in a forum. :)

I wonder if Jahnula aquatica is common in my area too, I'll keep my eyes open.

Best wishes,

Gernot

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