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21-11-2025 10:47

Mollisia sp.
François Freléchoux François Freléchoux

Bonjour,Peut-être Mollisia palustris ?Trouvée su

21-11-2025 10:50

Orange small asco?
Mirek Gryc

Hello Please help me identify this little asco.It

21-11-2025 15:22

asco 21-11-25
Vasileios Kaounas Vasileios Kaounas

Found in moss, forest with Pinus halepensis. Dime

21-11-2025 11:52

Sepultaria arenicola
Jean-Luc Ranger

Bonjour à tous, on voit toujours 2 espèces areni

21-11-2025 10:56

Ascomycete on Humulus
Christopher Engelhardt Christopher Engelhardt

Very small (~0,5 mm) white ascos, found yesterday

29-06-2016 18:06

Encoelia
Elisabeth Stöckli

Bonjour,Trouvé sur branches mortes cortiquées de

14-11-2025 16:26

Small species on Cytisus scoparius
Marian Jagers Marian Jagers

Hello everyone, On dead wood of Cytisus scoparius

17-11-2025 21:46

Lachnum impudicum
Philippe PELLICIER

Bonjour,Récolté sur bois pourrissant de feuillu

20-11-2025 14:14

Unknow species on 'Juglans regia', possibly fusarium spec?
Mick Peerdeman

Found on the leaves of 'Juglans regia' in the Neth

20-11-2025 13:07

Possibly 'Ascochyta Malvae' on 'Malva sylvestris (cultivar)'?
Mick Peerdeman

In January i found these black markings on the dea

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Hymenoscyphus on petiole
Stefan Jakobsson, 19-08-2022 19:05
On a petiole of a leaf of what seems to be Populus tremula (even though I can't fully exclude Alnus) I found an long-stipitate Hymenoscyphus. The spores are slender (20.9)24.1-29.0(31.0) × (3.6)3.7-4.2(4.4) µm and the asci short 87-95 × 8.2-9.7 µm, without croziers. The excipulum seems to have some hairs with yellowish content.

If looking at the spores alone it could fit H. fastidiosus, but the full picture is more complicated.


What should I call this one?


Stefan

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Bernard Declercq, 19-08-2022 20:26
Bernard Declercq
Re : Hymenoscyphus on petiole
Hi Stefan,

This is what I am used to call H. scutula var. pteridis, the non-ciliate form of H. scutula ss. str.
I don't know if these taxa have been sequenced in order to know if the second one is in need of an upgrade to species level.

Bernard

Stefan Jakobsson, 19-08-2022 21:13
Re : Hymenoscyphus on petiole
Thank you!

That one is said to have oil content 5 (about 80 percent) and I took this one to have lower oil content.
Hans-Otto Baral, 20-08-2022 06:52
Hans-Otto Baral
Re : Hymenoscyphus on petiole
Difficult to comment. Spore length is a bit over H. scutula.

In my scutula folder is a sample by T. Hülsewig

"Hymenoscyphus scutula, 2.XI.2018"

on dead stems of Eupatorium sp.

This seems to me the long-spored form of H. scutula, "H. fucatoides nom. prov.", which is in my folder "fucatus aff. H-". But it could also be H. scutula. It has short setulae at the spore base.

The problem with H. scutula is, that several genetically different sequences exist in GenBank but without known morphology, so it is not even possible to say which H. scutula sequence is the typical one.

Bernard, you do not mean Feltgen's Helotium scutula f. pteridis? It is not in Index Fungorum and has spores 18-20 x 3.5-5 µm. Or you mean Hymenoscyphus pteridicola (Crouan) Kuntze which is a small-spored Cyathicula? Surely not Hymenoscyphus pteridicola Thind & Sharma which is H. macroguttatus.
Stefan Jakobsson, 20-08-2022 12:37
Re : Hymenoscyphus on petiole
I rechecked but did not find a single setula.

Bernard's key says Hymenoscyphus scutula (Pers.: Fr. )Phill. var. pteridis (Feltgen) Declercq stat. nov. ined.