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29-08-2025 05:16

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Hymenium of Mollisia affected by parasite?

François Bartholomeeusen, 03-05-2023 21:20

Dear forum members,

While microscopically examining some fruiting bodies on wood that I could identify as Mollisia fusca, I observed two strange phenomena ... I don't know if there is a connection between the two.
1) After taking photos of asci, paraphyses and spores of the mollisia (photo 1a), I found where normally the hymenium is, conidiogenic structures with lacrymoid conidia 9 x 2.7 µm) (photos 1b-1c):

2) Three days later, the hymenium of most of the fruiting bodies (photo 2a) was seemingly gone or heavily affected by presumably a parasite? Conidia globose to amygdaliform with sometimes a kind of pedicel: 11-15 x 7-9 µm.

Does anyone have experience with these phenomena or perhaps a possible cause.

Many thanks for any information,

François Bartholomeeusen

Hans-Otto Baral, 03-05-2023 21:27

Hans-Otto Baral

Re : Hymenium of Mollisia affected by parasite?

I cannot say, the inflated structures do not really look like the possible chytrid that has repeatedly been observed in Mollisia. No idea for the conidia.

François Bartholomeeusen, 03-05-2023 21:47

Re : Hymenium of Mollisia affected by parasite?

Dear Zotto,

Thank you for your quick reply. A "chytrid" is unknown to me, and does that refer to 2) the "conidia" 11-15 x 7-9 µm

Warm regards,
François

Hans-Otto Baral, 03-05-2023 22:00

Hans-Otto Baral

Re : Hymenium of Mollisia affected by parasite?

the order Chytridiomycetes is a guess of mine for parasites in Mollisia which I repeatedly studied. In my Helicogonium article is a drawin of such a case. No, the conidia I cannot address.

Thomas Læssøe, 04-05-2023 09:01

Re : Hymenium of Mollisia affected by parasite?

Tremella discicola Van de Put is a hymenial parasite in Mollisia but I do not recall its characters as those shown here. Syzygospora s.l. also occurs in discomycete hymenia and Xenolacne longicornis (app. not in Mollisia).

here are some Danish records of chytrids:

https://svampe.databasen.org/observations/10259245

https://svampe.databasen.org/observations/10256834

Hans-Otto Baral, 04-05-2023 09:36

Hans-Otto Baral

Re : Hymenium of Mollisia affected by parasite?

Hi Thomas

interesting, do you have the publication?

Tremella discicola Van de Put, Sterbeeckia 24: 12 (2004)

Your parasites look different than those in Mollisia, but at least the second link should refer to the same kind of chytrid-like parasite.

Zotto

Martin Bemmann, 04-05-2023 09:43

Martin Bemmann

Re : Hymenium of Mollisia affected by parasite?

This volume of Sterbeeckia is here:

https://kvmv.be/index.php/publicaties/item/sterbeeckia-24

Regards

Martin

François Bartholomeeusen, 04-05-2023 10:04

Re : Hymenium of Mollisia affected by parasite?

To Martin,
Thanks, while I was formulating my reply you already delivered the publication ... "faster than his own shadow !!!"

To Thomas,
many thanks the pictures in the link Chytridiomycota are identical to mine point 2)

To Zotto,
I now have a lot to think about and study. Browsing through your "Ascomycetes illustrations" I found my own photos of the item on Ascofrance with this link: http://www.ascofrance.com/search_forum/45936
I think I can say on behalf of many Ascofrance nembers that we are very grateful to you for making your wealth of information freely available. Thanks again!

François

Hans-Otto Baral, 04-05-2023 10:10

Hans-Otto Baral

Re : Hymenium of Mollisia affected by parasite?

Thanks, so this Tremella has globose basidiospores.

Francois, also I would not have remembered that you found the "hacked Mollisia" already in 2016.

Przemyslaw Drzewiecki, 04-05-2023 23:31

Re : Hymenium of Mollisia affected by parasite?

Hello,
a few days ago I met the alleged Tremella discicola on some Pyrenopeziza sp. (?) on a blade of grass. If my guess is correct, perhaps it is a complex of species specialized for different hosts? By no means the spores in my collection are not globose.
Regards - Przemek

Przemyslaw Drzewiecki, 04-05-2023 23:54

Re : Hymenium of Mollisia affected by parasite?

Hi,
here is an example of a hitherto undescribed Syzygospora sp. hosted by what I have been able to determine is Hymenoscyphus scutula:

https://www.bio-forum.pl/messages/33/1035877.html

Forgive me everyone, I know this forum is about Ascomycetes, but as you know many species of "Heterobasidiomycetes" are closely related to ASCO. :-)
Przemek

Hans-Otto Baral, 05-05-2023 07:22

Hans-Otto Baral

Re : Hymenium of Mollisia affected by parasite?

Thanks for your interesting contribution! I agree it looks like a Pyrenopeziza. A Hymenoscyphus I could not detect on your link, but such a parasite I might have seen in some publication.