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11-04-2026 10:42

Una para ID
Castillo Joseba Castillo Joseba

Me mandan el material de Galicia, España, recolec

11-04-2026 10:19

Bientôt, un nouveau livre important
Michel Hairaud Michel Hairaud

Chers amis d'Ascofrance , voici une très bonne no

11-04-2026 10:10

An important new book
Michel Hairaud Michel Hairaud

Dear Ascofrance members, here is some very good ne

10-04-2026 23:22

Pyreno on Phragmites australis
Gernot Friebes

Hi,ascospores are 1- to 3-septate, approximately 

10-04-2026 15:51

Botrytis ficariarum & Peronospora ficariae?
William Slosse William Slosse

Hello everyone, On 08/04/26, I found a growth sit

09-04-2026 15:25

Slerotinia verrucispora ???
Jac Gelderblom

On bare soil between mosses Ifound an asco I deter

09-04-2026 13:55

Small-spored "Diplodia" on broom (Cytisus scoparius) - Denmark
Thomas Læssøe

https://svampe.databasen.org/observations/10589176

09-04-2026 10:12

Melanosporalian on attached decayed wood on fallen Carpinus, Denmark - very long-necked
Thomas Læssøe

https://svampe.databasen.org/observations/10587061

08-04-2026 20:33

Gyromitra sp. ?
Vasileios Kaounas Vasileios Kaounas

Found 07-04-26, in Abies cephalonica. Diameter 1,

08-04-2026 10:39

Littérature Korf
FRANCIS FOUCHIER

Bonjour , je recherche en pdf cet article: KORF R

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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.