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03-02-2020 20:28

Parasite on Xanthoria parietina apothecia (arthonioid?) - Denmark Feb. 2020
Thomas Læssøe

https://svampe.databasen.org/observations/10080840

03-02-2020 19:16

on pinus sylvestris wood
Robin Isaksson Robin Isaksson

Have someone a clue for this one?asci are 8 spored

03-02-2020 12:52

Trichopeziza on wood. Betula?
Mirek Gryc

Hi I have not yet encountered such a species, gro

03-02-2020 14:18

Small ASCO on Populus wood?
Mirek Gryc

Hi Sporocarps very small, therefore macro photos

01-02-2020 23:34

Nemania illita ?
Ethan Crenson

Hello all, This was found earlier this week in Ne

02-02-2020 20:31

Nemania?
Mirek Gryc

HiCould this be Nemania?Sporocarps grew on the dec

02-02-2020 21:18

Geopora foliacea (?) en xérobrometum
Bernard CLESSE Bernard CLESSE

Sur microsol humifère d'une dalle calcaire xérop

03-02-2020 00:00

Penicilliopsis clavariaformis or africana?
Andreas Gminder Andreas Gminder

Hello,trying to identify a pretty big clavarioid-l

02-02-2020 19:17

=> Hyphodiscus hemiamyloideus nom. prov.
Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde, January 20

12-01-2020 10:28

FRDBI
Simon Kennedy

I apologise for raising this topic again, but can

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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 :-)