Yellow asco on Beech

[RobSutton]

After a ridiculously busy period at work I managed to get out and find a few fungi to photograph last weekend.

I'm struggling with this little yellow asco that seems to growing on what I'm pretty sure is Diatrype disciformis on a beech twig. Or if it's not growing on it's pretty closely linked to the Diatrype, maybe exploiting the weakness in the bark caused by it???



The spores are c12µ x 4µ and septate, some spores seem to be constricted at the central septum.



The paraphyses were very simple but with clear septa and the asci seemed to be I-



Any ideas of where to start with this one?

Thanks as always in advance.

[FungiJohn]

Hi Rob

Have you ruled out Bisporella citrina!

John

[Chris Yeates]

hi Rob

B. sulfurina is the Bisporella classically associated with Diatrypaceous fungi; that clustered habit and the fusoid spores look right for that species as well

cheers

Chris

[Ditiola]

Chris
I was going to say that: you beat me by 15 seconds

I have found this a few times this season

Peter

[RobSutton]

Originally Posted by FungiJohn

Hi Rob

Have you ruled out Bisporella citrina!

John

Hi John

I did look at B.citrina quite carefully as the spores seemed to match well but it was the association with the Diatrype that put me off and I'd only ever seen B.citirina growing on debarked wood and it looked a little flimsy for that species but I wasn't sure which species to look at next as there seemed to be a lot of small yellow cup like things around and then ....

Originally Posted by Chris Yeates

hi Rob

B. sulfurina is the Bisporella classically associated with Diatrypaceous fungi; that clustered habit and the fusoid spores look right for that species as well

cheers

Chris

Originally Posted by Ditiola

Chris
I was going to say that: you beat me by 15 seconds

I have found this a few times this season

Peter

Thanks Chris and Peter - another one for my Malham list, your help once again, is much appreciated.

[Ditiola]

Rob
As well as growing with Diatrypaceous fungi. B.sulfurina often grows in small clumps, the paraphyses do not thicken as much at the tip and the spores are often slightly curved and often with a restriction at the septa.

As I have now found it three times the last time only two weeks ago, it is perhaps one of the very few small discomyces I can now recognise, although I will probably have forgotten by next year

Peter