Cup on birch leaf - Forum ASCOFrance

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Cup on birch leaf

Guy Buddy, 29-05-2021 21:43

Hello, This fungus was growing on Betula leaves in a swampy area with rhododendron, thuga, viburnum, betula, alnus, symplocarpus, tussilago, and ferns etc. No crosiers, paraphyses filiform and slender. IKI - although it looks like a slight reaction from photos. No hairs or crystals observed. Spores mostly ellipsoid, measure ~ 6 x 4.5 um. Cranberry wilderness West Virginia USA, ~800 meters elevation. Any help appreciated, even if just a genus Devin

Guy Buddy, 29-05-2021 21:47

Re : Cup on birch leaf

More pics

Hans-Otto Baral, 30-05-2021 11:13

Re : Cup on birch leaf

Well documented, but you don't have a pic of the spores under oil, and the paraphyses, in water?

It looks to me sclerotiniaceous, but it has no stipe! - No idea

Marek Capoun, 31-05-2021 19:44

Re : Cup on birch leaf

What about the first picture in the second batch, isn't it possible to see crozier(s) there?

Lothar Krieglsteiner, 31-05-2021 20:26

Re : Cup on birch leaf

Hello Guy, Zotto and Marek,
I am not sure at all - but what if the leaf would be not Betula but Alnus, and the stalks are present but short. Then it could perhaps be Ciboria conformata. Or maybe C.c. could also rarely grow on Betula?
If I make a big mistake amd miss something relevant you may fforgive me ...
Best, Lothar

Hans-Otto Baral, 31-05-2021 21:23

Re : Cup on birch leaf

Hi Lothar, I think Alnus is a possibility, yes. But the croziers are in fact very clear, and C. conformata hasn't. The section and also the second photo clearly show that there is no stipe.

Viktorie Halasu, 01-06-2021 12:54

Re : Cup on birch leaf

Hello,
could it be a Moellerodiscus? I don't know where exactly is the border between Ciboria and Moellerodiscus.
Viktorie

Hans-Otto Baral, 01-06-2021 17:06

Re : Cup on birch leaf

I can't exclude that but I only know stipitate members of that genus.

The weak IKI reaction of the ascus tip would plead for that.

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