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07-12-2025 22:43

Leucostoma ?
Andreas Millinger Andreas Millinger

Good evening, tried to determine with Munks Valsa

07-12-2025 17:43

Helvella
Malcolm Greaves Malcolm Greaves

This Helvella was in mixed woodland. Uniform cupul

07-12-2025 16:07

Ascomycet mit Sammelfruchtkörper.
Arnold Büschlen

Hallo, ich habe in einer Moos-Aufsammlung (epiohy

05-12-2025 17:33

Lachnum sur feuille de chêne
Bruno Coué Bruno Coué

Bonjour, je serais heureux de recueillir votre avi

07-12-2025 09:24

Una Dacrymycetaceae
Castillo Joseba Castillo Joseba

De la pasada semana en Galicia EspañaEn el suelo

06-12-2025 00:19

Literature search (Raitviir Galán)
Viktorie Halasu Viktorie Halasu

Hello, would anyone have this article, please? An

04-12-2025 23:53

Anthracobia key
Malcolm Greaves Malcolm Greaves

Is there an up to date Anthracobia key available?T

04-12-2025 21:30

literature search
Ethan Crenson

Hello all, I am looking for the following:  Bar

02-12-2025 18:59

Round spores asco
Malcolm Greaves Malcolm Greaves

This pair of ascos 2.5cm across were on recently b

03-12-2025 20:02

Godronia sp.
Buckwheat Pete

Hello everyone, does anyone know the genus Godroni

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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.