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William Slosse William Slosse

Yesterday I found this species on the underside of

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Dear friends,is there anyone who has for me the ar

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Bitunicate asco on Betula
Enrique Rubio, 19-04-2012 20:37
Enrique RubioHi again

Do you know this bitunicate ascomycete with inconspicuous inmersed stromata with 1-2 pseudothecia, erumpent trought the bark of Betula small branches? 
Spores are inequally two celled and their walls are longitudinally striate (only visible in Melzer). They have some pseudosepta too.
I don't know what genus belongs this fungus  
Many thanks again
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Alain GARDIENNET, 19-04-2012 21:18
Re : Bitunicate asco on Betula
Hi Enrique,
You should look in the Pleomassariaceae. Perhaps it could be Pleomassaria siparia = Splanchnonema siparium but striate ornementation reminds me at other species which occurs on other hosts.
I will research more.
Alain GARDIENNET, 19-04-2012 21:22
Re : Bitunicate asco on Betula
I agree with René to say it isn't siparia. Personnaly, I thought at S. quercicola (on Quercus) which has striate ascopores, as yours.
Alain GARDIENNET, 19-04-2012 21:26
Re : Bitunicate asco on Betula
I think now it could be Splanchnonema argus. It occurs on Betula.
I let you verify.

Chris Yeates, 19-04-2012 21:49
Chris Yeates
Re : Bitunicate asco on Betula
Hello Enrique

if it is S. argus keep an eye out for the distinctive anamorph Myxocyclus polycystis:

best wishes

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Norbert Heine, 20-04-2012 00:42
Norbert Heine
Re : Bitunicate asco on Betula
Hi Enrique,

I'll give you a portrait of Splanchnonema argus and the anamorph Myxocyclus polycistis.
(By the way - fine photo, Chris!)

Some days ago I found this two species together on Betula - Twigs.
The spores of Splanchnonema argus were 60-72 x 14-17µm.
Now you can compare.

Best wishes


PS: And here you can read something more:
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Enrique Rubio, 20-04-2012 16:50
Enrique Rubio
Re : Bitunicate asco on Betula
Many thanks to all

I think my fungus is not S. argus because my ascospores with striate walls are not encapsulated.

I was looked for S. striatutulum and S. quercicola, as Alain and René said, and I think that S. quercicola is a good possibility. Do you know if this fungus has been collected in Europe?