18-05-2024 10:47
Anna KlosGoodmorning,We found this tiny ascomycete (max. 1m
25-03-2024 19:14
Juuso ÄikäsI found some small black pyrenos growing on a dead
10-05-2024 17:40
Anna KlosGood afternoon, Thursday during an inventory we f
17-05-2024 16:25
Pavel JiracekErioscyphella lunata, found on a fallen needle of
29-01-2022 21:44
Jan EcksteinGood evening, apothecia small, yellowish, 150-300
16-05-2024 11:19
Sylvie Le GoffBonjour, j'ai récolté sur une branchette de feui
14-05-2024 09:19
Hans-Otto BaralHi, I want to announce for next Sunday 17.00 middl
16-05-2024 11:49
Castillo JosebaDe ayer en rama de abetoNo se por donde mirarA ver
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
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