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Åke Widgren
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Marc Detollenaere
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Åge OterhalsI hope someone can confirm the name of this collec
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François BartholomeeusenDear forum members,On 23 March 2026, I found sever
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Miguel Ángel Ribes
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Bernard CLESSE
Bonjour à toutes et tous,Pourriez-vous me confirm
Dermea(?) on Alnus
Gernot Friebes,
02-06-2015 12:49
I'm assuming this is a Dermea but I couldn't find a fitting species. It grew on the bark of a dead Alnus tree. What's striking is that the asci are "4-spored", because 4 spores are aborted early and only 4 spores mature. The ascospores measure about 20.1–24.4 x 8.5–9.7 µm and the asci measure about 116.3–140.0 x 15.9–20.0 µm. Unfortunately I didn't have Lugol readily available while studying this fungus (shame on me!) but at least in Melzer's reagent the asci are negativ, however it seems like the apical apparatus is slightly stained by the Melzer's (just no amyloid reaction).
Any ideas?
Thank you and best wishes,
Gernot
Hans-Otto Baral,
02-06-2015 13:00
Re : Dermea(?) on Alnus
Hi Gernot
I hope it is not true that you used MLZ. But it seems so, because Pezicula frangulae reacts deeply red in Lugol. - Sorry, now I read the reason for using MLZ. O.k., nice example how Melzer's is misleading.
How sure are you with Alnus?
Zotto
I hope it is not true that you used MLZ. But it seems so, because Pezicula frangulae reacts deeply red in Lugol. - Sorry, now I read the reason for using MLZ. O.k., nice example how Melzer's is misleading.
How sure are you with Alnus?
Zotto
Gernot Friebes,
02-06-2015 13:27
Re : Dermea(?) on Alnus
Hi Zotto,
yeah, I forgot to bring my Lugol and only had Melzer's available. :-/ Had I used Lugol I probably would've realized it's a Pezicula rather than a Dermea but as it were the dark apothecia lead me towards Dermea. I guess that's what you get for using Melzer's!
As for the substrate, I know that Frangula was also present but from what I've seen only as much smaller trees... But it could be possible that the substrate was indeed Frangula.
Thanks for your help and best wishes,
Gernot
yeah, I forgot to bring my Lugol and only had Melzer's available. :-/ Had I used Lugol I probably would've realized it's a Pezicula rather than a Dermea but as it were the dark apothecia lead me towards Dermea. I guess that's what you get for using Melzer's!
As for the substrate, I know that Frangula was also present but from what I've seen only as much smaller trees... But it could be possible that the substrate was indeed Frangula.
Thanks for your help and best wishes,
Gernot
Hans-Otto Baral,
02-06-2015 16:07
Re : Dermea(?) on Alnus
You can verify the substrate: Frangula is distinctly ring-pored though with small pores. Alnus is scattered-pored, also it has characteristic scalariform perforations (leiterförmig).
Gernot Friebes,
02-06-2015 20:29
Re : Dermea(?) on Alnus
I only have rather thin pieces of wood that I cut off with the bark but I tried to make a few sections. I put a piece of millimeter paper into the photos to provide some sort of scale. Is it possible to say something with these photos?
Best wishes,
Gernot
Best wishes,
Gernot
Hans-Otto Baral,
02-06-2015 21:22
Re : Dermea(?) on Alnus
Prima! Definitiv kein Alnus, aber sehr gut passend zu Frangula alnus! Schön ringporig.
Gernot Friebes,
02-06-2015 21:42
Re : Dermea(?) on Alnus
Sehr schön, dann passt das ja!
Danke nochmals!
Schöne Grüße
Gernot
Danke nochmals!
Schöne Grüße
Gernot