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30-06-2025 12:09

Edvin Johannesen Edvin Johannesen

This tiny, rather "rough" erumpent asco was found

30-06-2025 16:56

Lydia Koelmans

Please can anyone tell me the species name of the

30-06-2025 14:45

Götz Palfner Götz Palfner

This is a quite common species on Nothofagus wood

30-06-2025 06:57

Ethan Crenson

Hi all, Another find by a friend yesterday in Bro

30-06-2025 19:05

ALAIN BOUVIER

Bonjour à toutes et à tousJe cherche à lire l'a

25-06-2025 16:56

Philippe PELLICIER

Bonjour, pensez-vous que S. ceijpii soit le nom co

29-06-2025 18:11

Ethan Crenson

Hello all, A friend found this disco yesterday in

28-06-2025 17:10

Peter Welt Peter Welt

I'm looking for: RANALLI, M.E., GAMUNDÍ, I.J. 19

28-06-2025 16:00

Josep Torres Josep Torres

Hello.A tiny fungus shaped like globose black grai

27-06-2025 14:09

Åge Oterhals

I found this pyrenomycetous fungi in mountain area

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Possible Hymenoscyphus fructigenus
B Shelbourne, 27-08-2024 19:03
B ShelbourneI found some Hymenoscyphus-like apothecia on cupules and acorns of Quercus robur, spores seem to fit with Hymenoscyphus fructigenus too.

Habitat: Found yesterday (late August) after some rain, on acorns and cupules of Quercus robur, in damp and shady areas under a dead hedge fence (stacked dead wood), generally quite a damp muddy area, in mixed deciduous woodland with lots of Quercus and Corylus, ~25m elevation, Lower Weald, England.

Apothecia: Several with 0.5-1.5 mm diameter and some larger ones observed, < 10 mm stipe length depending on evironment, initially whitish and more translucent, yellowing with age (especially noticeable on disc), singular to caespitose, superficial, cyathiform and eventually discoid, margin more whitish and often undulating when mature, appearing to display geotropic growth and growing out of holes in the acorns.

IKI: Rings bb, hymenoscyphus-type, VBs with strongly dextrinoid reaction.

Spores: Elongated lacrymoid in face view, base acute and apex hemispherical, constricted at the middle and scutuloid in profile view, many small to medium VBs and some tiny LBs, appearing aseptate and uninucleate.

Free spores measured in water: 17.3-20.6 (21) x 4.4-4.7 um, Q = (3.7) 4-4.6 (4.7), n = 14, mean 19.3 x 4.5 um, Q mean = 4.2.

Asci: Cylindrical-clavate, apex appears acute-truncate, 8-spored, poroid, simple septa (furcations not clearly observed).

Paraphyses: Narrow cylindrical, with many small VBs, especially towards apex, apparently several at least 2-septate, most branching close to the base.

Ectal ex: Looks like textura prismatica (typica?), some narrower external hyphae with VBs.

Medullary ex: Looks like textura intricata.
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Hans-Otto Baral, 27-08-2024 21:27
Hans-Otto Baral
Re : Possible Hymenoscyphus fructigenus
Yes of course, typical H. fructigenus. Exciple has a typical prismatica.
B Shelbourne, 28-08-2024 11:35
B Shelbourne
Re : Possible Hymenoscyphus fructigenus
Thank you for looking and confirming the structure of the ectal excipulum.

Do you recognise any subgroups or varieties?

On IF, 'var. carpini' was elevated to species level by Gminder (2016). I guess on acorns in Western Europe with typical morphology would suggest this collection is 'var. fructigenus'.

Hans-Otto Baral, 28-08-2024 12:00
Hans-Otto Baral
Re : Possible Hymenoscyphus fructigenus
This is unclarified. Once I thought that every host genus has its own species but data are so far lacking and morphology is very similar. H. carpini has smaller spores, though.
B Shelbourne, 28-08-2024 15:12
B Shelbourne
Re : Possible Hymenoscyphus fructigenus
Thank you. It seems not much has changed since your comments in the 1996 H. seminis-alni paper. Here you also reference collections on nuts of several genera and species.

I have seen similar apothecia on acorns before but not on hazelnuts. I can look more though as there are many around in the same wood and even close to where I found these acorns. It also seems interesting that they grow on the cupules as well as what seems to be the pericarp.


I can't find any discussion of an anamorph of H. fructigenus. Although I did find this interesting paper looking at mating genes in genomes of Leotiomycetes. I haven't read it properly yet, but they suggest many H. spp., including H. fructigenus, are homothallic. Presumably outcrossing between individuals on different nuts, if possible, would then be rarer anyway.


Wilson AM, Coetzee MPA, Wingfield MJ, Wingfield BD. Needles in fungal haystacks: Discovery of a putative a-factor pheromone and a unique mating strategy in the Leotiomycetes. PLoS One. 2023 Oct 12;18(10):e0292619.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10569646/