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25-04-2025 17:24

Cosmospora/Dialonectria spec.
Stefan Blaser

Hi everybody, This collection was collected by JÃ

11-02-2026 22:15

Rutstroemia maritima?
William Slosse William Slosse

Today, February 11, 2026, we found the following R

11-02-2026 19:28

Pezizaceae spec. from Germany
Lothar Krieglsteiner Lothar Krieglsteiner

on small deciduous twig on the ground in forest wi

09-02-2026 22:01

Sp
ruiz Jose

Hola, me paso esta colección en madera de pino, t

10-02-2026 17:42

Hélotiale blanche sur Sambucus racemosa
Bernard CLESSE Bernard CLESSE

Bonjour à toutes et tous,Pourriez-vous me donner

10-02-2026 18:54

Unknown pink heliotale on sphagnum
Erik Van Dijk

Does anyone has an idea what fungus species this m

09-02-2026 20:10

(2 different or one ?) Hypoxylon from the Algarve – on Acacia and Arbutus
Lothar Krieglsteiner Lothar Krieglsteiner

The first 6 tables show surely one species with 2

09-02-2026 14:46

Cistella granulosella of Hyphodiscus incrustatus?
Anna Klos

Goedemiddag, Op donderdag 5 februari vonden we ti

09-02-2026 11:42

Lachnum sp.
Ã…ge Oterhals

Hi forum, I found this Lachnum on old hardwood tw

02-02-2026 21:46

Dark disc on Populus
Margot en Geert Vullings

On a barkless poplar branch, we found hairy discs

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On Quercus robur petioles
Elsa Sousa, 07-11-2017 23:57
Hi,

Is that possible to identify this?

Spores (22) 22.4 - 27.7 (32.1) × (3.1) 3.4 - 4 µm 1-septate

Paraphyses septate

I would appreciate any help.

Thank you very much.
Regards,
Elsa
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Peter Püwert, 08-11-2017 02:12
Peter Püwert
Re : On Quercus robur petioles
Hi Elsa,
in my opinion this fungus belongs to the Rhytismataceae, genus Hypoderma. From the genus I know, unfortunately, only H. commune and rubi, both caulicol.
Greetings Peter.
Elsa Sousa, 09-11-2017 00:30
Re : On Quercus robur petioles
Dear Peter,
 
I suspected about Hypoderma, but can't get to species. I read that this is hard to identify.
This fungus wasn't exactly on petiole, but a bit inside, but still on central leaf nervure.

Thanks for helping.
Regards,
Elsa
Jason Karakehian, 09-11-2017 14:38
Jason Karakehian
Re : On Quercus robur petioles
I think that is Hypoderma. I don't think that there is a modern key to this genus. There is an unpublished PhD thesis by Paul E. Powell to Cornell University 1974. It is sometimes helpful. It lists H. ilicinum, H. rubi complex and an "H. taxonomic sp. 1" as being on Quercus. I recently tried to determine some material from Florida on Quercus and could not decide between H. ilicinum and H. rubi. I put a tentative name of H. rubi on the specimen.