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10-05-2025 18:47

Hyphomycetes
David Chapados David Chapados

Hi, Does anyone have an idea of what this could b

09-05-2025 16:01

Chaetosphaerella phaeostroma (Anamorphe Oedemium minus).
Thomas Flammer

I found a black cushon which might eventually be 

09-05-2025 19:10

Orbilia on Betula bark
Enrique Rubio Enrique Rubio

Hi to everybody.This Orbilia (apos up to 0.5 mm),

02-05-2025 13:29

Bryomyces
Isabelle Charissou

Bonjour, j'aimerais savoir s'il y a eu des public

06-05-2025 13:37

Looking for digital literature of Munk Anders
Thomas Flammer

Munk, Anders (1953). The System of the Pyrenomycet

08-05-2025 20:50

Greyish aquatic asco
Andreas Jacob

Good evening, due to contstant drought I started

07-05-2025 18:29

Olla or Urceolella?
Francois Guay Francois Guay

I found this small hyaline ascomycete on moist, de

08-05-2025 02:22

White Lasiobelonium?
Francois Guay Francois Guay

I found this white, hairy ascomycete on the bark o

08-05-2025 18:32

On Yucca filamentosa - conidia like Robillarda, but aseptate
Ethan Crenson

Hello all, I was looking at leaves of Yucca from

08-05-2025 08:59

Xylaria para ID 0402
Castillo Joseba Castillo Joseba

Me mandan el material de Galicia, (España) , reco

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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.