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20-03-2026 12:53

Eutypa spec. (?)
Stefan Blaser

Hello everybody, In the field, from distance, my

19-03-2026 19:34

Xylariaceae? on Carpinus betulus wood
Filip Fuljer Filip Fuljer

Hello everyone,a few days ago I collected this str

19-03-2026 18:25

Myriosclerotinia curreyana?
William Slosse William Slosse

Good evening everyone, On 18/03/26 I found a few

17-03-2026 10:09

Lasiobelonium corticale ?
François Freléchoux François Freléchoux

Bonjour, Voici la description rapide d'un petit d

19-03-2026 15:58

"Lasiosphaerioid"
Stefan Blaser

Hello everybody, I hope for some hints... Macro:

19-03-2026 17:50

Massarina on Corylus
Enrique Rubio Enrique Rubio

Hi to everybodyThese thiny, blackish pseudothecia

18-03-2026 13:09

Orbilia on Celtis occidentalis
Khomenko Igor Khomenko Igor

I recently examined Celtis occidentalis branches

17-03-2026 19:41

Pyréno sur branche morte de chêne
Bernard CLESSE Bernard CLESSE

Bonsoir à toutes et tous,Pourriez-vous m'aider à

18-03-2026 17:22

Literature search
Katarina Pastircakova

Hi there,I'm looking for the following literature:

19-03-2026 10:56

Sporodochial anamorph on Populus with angular, pigmented conidia - Denmark
Thomas Læssøe

https://svampe.databasen.org/observations/10505643

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Asco on Arnica
Maren Kamke, 16-06-2013 16:39
Maren KamkeHello everybody,
I found an ascomycete (0,1 mm) on arnica.
Spores (11-13) 11,72 x 3,88 (3-4,5) µm, with two bigger oildrops and many small ones on both ends.
Asci 48-50 x 9-11, IKI blue, paraphyses 3 µm.
Thanks
Regards
Maren
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Hans-Otto Baral, 16-06-2013 17:25
Hans-Otto Baral
Re : Asco on Arnica
Hi Maren

you made no mistake with 0.1 mm? And it was in the mountains? On the old stems?

No idea actually. I looked in my database for Asteraceae with such a spore size, no good result.

Something of the Naevioideae perhaps. Schizothyrioma has larger apos and is reported on Achillea.

Zotto
Maren Kamke, 16-06-2013 23:15
Maren Kamke
Re : Asco on Arnica
Hi Zotto,
thank you for your opinion.
There is an artifical arnica meadow on the westcoast of Schleswig-Holstein, we accompanied the botanical sektion to this spot to look after ascomycetes on arnica. What we didn't knew was that the meadow is mowed regularly and the clippings are removed. So we searched for arnica-stems. The botanist I talked to identified my stem as arnica, but it is not impossible that he was wrong.
On the same stem I found Cyathicula tomentosa,  Mollisia cf. revincta (still without spores :( and Leptospora rubella.

The apos are really very small, max up to 0,15 mm.
I checked with the Naevioideae? on your DVD, the color and the macroscopical habitus matches Ploettnera solidaginis, but the microscopical details of course not.
The spores get one septa with age.
I think it could be a Diplonaevia sp. but which one?


Regards Maren

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Hans-Otto Baral, 17-06-2013 06:56
Hans-Otto Baral
Re : Asco on Arnica
Ploettnera is not a bad idea, but it has a special type of apical ring (only the lower part of the wall reactive). Diplonaevia has a strongly protruding margin, which is to some extent also the case in your specimen. A Pyrenopeziza would be an alternative genus for your fungus, though such wide spores are unusual.

Arnica is not in the list of substrates in Hein 1976.

Zotto