Hymenocyphus or Rutstroemia - Forum ASCOFrance

25-04-2025 17:24

Cosmospora/Dialonectria spec.

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Hi everybody, This collection was collected by J�

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Bonjour à toutes et tous,Pourriez-vous me donner

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Dark disc on Populus

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Hello! I found this species that resembles Delitsc

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Hymenocyphus or Rutstroemia

Pavel Jiracek, 08-10-2024 13:44

I think this is R.bolaris. How can I verify that and eliminate Hymenocyphus?

On a piece of unidentified wood (Alnus, Crataegus?), Central Scotland.

Spores 16x5, asci 130-140x10-11
Fruit bodies up to 8 mm across.

Thanks

Hans-Otto Baral, 08-10-2024 17:37

Re : Hymenocyphus or Rutstroemia

Clearly a Hymenoscyphus, and it looks much like the common H. subferrugineus.

Pavel Jiracek, 08-10-2024 18:20

Re : Hymenocyphus or Rutstroemia

Thanks, Hans-Otto,
Can you, please, share what made you identify it? Macro micro or both?
It is large, 8mm.

Hans-Otto Baral, 09-10-2024 20:25

Re : Hymenocyphus or Rutstroemia

You can look into my folders, I have a folder "Hymenoscyphus calyculus-group".

In a wide sense this is H. calyculus, but I learned by type studies that H. subferrugineus (= Helotium broomei) fits what I often found, whereas H. calyculus remained a very difficult species which I did not see since again a long time.

H. subferrugineus has a bit shorter, more cylidrical (less scutuloid) spores.

My article on this is regrettable still unfinished.

Pavel Jiracek, 09-10-2024 20:34

Re : Hymenocyphus or Rutstroemia

Thank you again. I'll check your folders.

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