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06-04-2026 15:04

Gnomoniaceae
David Chapados David Chapados

Hi! Could someone help me identifying this specim

29-06-2016 15:18

Scopinella
Per Vetlesen

HiIt was found on the bark of a dead branch of Jun

07-01-2018 22:47

Scopinella?
Per Vetlesen

Grown in moist chamber on bark/resin of fallen Pin

06-04-2026 21:36

Literature search
Viktorie Halasu Viktorie Halasu

Hello, could anyone please send me the article wi

06-04-2026 19:40

Nectriaceae on Fagus
David Gibbs David Gibbs

Help with this one much appreciated, on rotting Fa

06-04-2026 11:07

Arachnopeziza delicatula
Louis DENY

Bonjour forum, Trouvé sur bois de feuillu très d

06-04-2026 16:24

Helotiales on Pinus needles
Juuso Äikäs

Last Tuesday I found some tiny white Helotiales gr

05-04-2026 13:33

Mollisia sp?
Sylvie Le Goff

Bonjour à tousPuis avoir votre avis sur ce champi

05-04-2026 20:40

Durella on Abies bark
Robin Isaksson Robin Isaksson

Hi!Found i Japan on bark of Abies sp. Spores 35-4

06-04-2026 08:15

minute hairy discomycete from Portugal - Fuscolachnum?
Lothar Krieglsteiner Lothar Krieglsteiner

some days ago, on the lower surface of leaf of Que

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Parasite on Xanthoria parietina apothecia (arthonioid?) - Denmark Feb. 2020
Thomas Læssøe, 03-02-2020 20:28
https://svampe.databasen.org/observations/10080840

KOH gave a striking pink reaction at upper leves of the hymenium

cheers

Thomas
ps on some apothecia this fungus co-occured with Pyrenochaete xanthoriae
Alain GARDIENNET, 03-02-2020 21:19
Alain GARDIENNET
Re : Parasite on Xanthoria parietina apothecia (arthonioid?) - Denmark Feb. 2020

Hi Thomas,


It fits well with Arthonia parietinaria. Epihymenium id K+ for this species, but K- for A. molendoi.


Thus, we know (since 2016  , Fleischhacker et al.), that A. parietinaria occurs on X. parietina when A. molendoi occurs more on X. elegans.


Alain

Martin Bemmann, 03-02-2020 21:34
Martin Bemmann
Re : Parasite on Xanthoria parietina apothecia (arthonioid?) - Denmark Feb. 2020
Hi Alain, A. parietinaria was my first guess as well. But I withdrew because of the "chestnut-brown" KOH reaction stated by Fleischhacker etal:


The pink reaction observed by Thomas would fit more to A. destruens, described as "purplish violet".

However, I have no own observations.

Regards

Martin
Thomas Læssøe, 03-02-2020 21:55
Re : Parasite on Xanthoria parietina apothecia (arthonioid?) - Denmark Feb. 2020
yes, both described colour reactions a bit off from my clear pink....
Alain GARDIENNET, 03-02-2020 21:59
Alain GARDIENNET
Re : Parasite on Xanthoria parietina apothecia (arthonioid?) - Denmark Feb. 2020

Hi Martin,


Yes I noted this strange colour. But A. destruens is not given on X. parietina. Thus ascospores are bigger.


It would be good to check the reaction with next collections of Arthonia parietinaria. If I find time, I will check with mines.


Thomas, please keep it in herbarium under Arthonia sp. cf A. parietinaria.


Alain

Thomas Læssøe, 03-02-2020 23:19
Re : Parasite on Xanthoria parietina apothecia (arthonioid?) - Denmark Feb. 2020
will do and thanks :-)