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27-04-2026 20:52

Mollisia or related genus from Portugal - with quite peculiar character
Lothar Krieglsteiner Lothar Krieglsteiner

Found on hanging tiwg of Olea europaea in dried-ou

27-04-2026 18:48

Micropodia pteridina?
Tony Moverley

Collected 23rd April 2026, Norfolk, EnglandSwarms

27-04-2026 17:41

another anamorph on monocotyleous remains from Portugal
Lothar Krieglsteiner Lothar Krieglsteiner

.. Algarve, same leaf than the last post. The con

27-04-2026 18:05

bright green minute anamorph on Citrus aurantius-twig from Portugal
Lothar Krieglsteiner Lothar Krieglsteiner

... still attached at standing tree. The green con

27-04-2026 17:16

anamorph on monocotyleous leaves from Portugal
Lothar Krieglsteiner Lothar Krieglsteiner

.. Algarve, moist lying.The conidiomata look like

27-04-2026 12:54

Spiral conidial crust
Steve Clements

Bonjour. Ce petit champignon blanc résupiné et

27-04-2026 09:59

Microdiplodia henningsii
Pauline. Penna

Bonjour Can anyone advise me on these pycnidia fo

26-04-2026 21:08

Ramularia sp ?
William Slosse William Slosse

Several species of Ramularia occur on Rumex that I

22-04-2026 20:54

Pyrenopeziza on monocot.
Enrique Rubio Enrique Rubio

Hi to everybody.This Pyrenopeziza grew in moist le

25-04-2026 11:34

lachnum pudicellum
Louis DENY

Bonjour forumdans la clé de Zotto, L. pudicellum

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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 :-)