Mollisia on Rubus idaeus - Forum ASCOFrance

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Mollisia on Rubus idaeus

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Hi, Found in March on last years stick from Rubus

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Mollisia on Rubus idaeus

Mathias Hass, 10-04-2025 10:09

Hi,

Found in March on last years stick from Rubus idaeus, Denmark.

Apotecia: Do not seem to be erumpent, sessile, smooth grey disk, with anchoring hyphae, bright yellow colour extracted with KOH.
Asci: IKI+, I think with croziers, approx. 53 (40-55) x 5-5,5 my.
Ascospores: 1-celled, mostly clavate, 10,2 (8,3-12,4) x 2,1 (1,7-2,5) my, Q=4,9 , n=20. With some droplets.
Paraphyses: Cylindrical, 3 my wide, with large light diffracting LBs.
Excipulum: Mostly roundish dark cells, some dark hairlike cells seen.

Any help much appreciated.

Kind Regards
Mathias

Lothar Krieglsteiner, 10-04-2025 10:11

Re : Mollisia on Rubus idaeus

perhaps compare M. revincta.
Yours, Lothar

Mathias Hass, 10-04-2025 10:27

Re : Mollisia on Rubus idaeus

Thanks Lothar for your quick respons.

Can M. vincta be strongly KOH+ ? Using Gminder's key (or some version of it) I tend to end up in "M. cf. polygoni"...

Cheers

Mathias

Lothar Krieglsteiner, 10-04-2025 10:31

Re : Mollisia on Rubus idaeus

M. revincta ist wohl bezüglich der KOH-Reaktion recht variabel, ist vermutlich auch noch eine Sammelart.
Hier kannst Du wertvolle Infos lesen:
https://asco-sonneberg.de/pages/gallery/mollisia-revincta-epilobium-koh-110910-01xs21751.php
Dort steht u.a. auch:

Auf die KOH-Reaktion kann man sich wahrscheinlich nicht gut verlassen. Zwar ist sie meist mittelstark und vergänglich, jedoch sind mir von Rubus auch stark gelbe und anhaltende Reaktionen bekannt

Dein Fund ist ja von Rubus.

Mathias Hass, 10-04-2025 13:05

Re : Mollisia on Rubus idaeus

Thaks a lot, M. revincta looks promising then. I'm wondering why according to IF the current name of Mollisia revincta is Pyrenopeziza revincta. I thought that the large LBs in the parafyses are diagnostic for Mollisia?

Cheers

Mathias

Lothar Krieglsteiner, 10-04-2025 13:12

Re : Mollisia on Rubus idaeus

Ich weiß nicht, warum die Art in Pyrenopeziza geführt wird. Und ja: die Vakuolenkörper in den Paraphysen stehen für Mollisia.

Lothar Krieglsteiner, 10-04-2025 13:13

Re : Mollisia on Rubus idaeus

ah - sorry that I wrote in German. I thought you would be German, too, but now I see you are Danish :-)
Yours, Lothar

Mathias Hass, 11-04-2025 07:33

Re : Mollisia on Rubus idaeus

Geht auch auf Deutsch :-) Eigentlich meine Muttersprache, brauche es aber wenig, und Deutsch schreiben fällt mir leider schwehr, verstehen ist kein Problem.

Grüsse Mathais

Mathias Hass, 12-04-2025 07:45

Re : Mollisia on Rubus idaeus

I see that Zotto has a folder called "clavata (=alcalireagens) Rubus + Reynutria KOH+, ap. smooth, 7.5-11,5 " which to me looks similar too. Could M. clavata, M. revincta on rubus, M. alcalireagens all be the same thing?

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