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30-03-2026 12:18

Demande d'aide
Sylvie Le Goff

BonjourRécolté sur la base de Pteridium aquilinu

25-03-2026 10:35

Encoelia impudicella?
Hulda Caroline Holte

Hello,I collected this species growing on a dead b

28-03-2026 17:41

Mollisia sur Molinia
Louis DENY

Bonjour forum,Mollisia trouvée sur tige de Molini

30-03-2026 12:03

Dumontinia on Ficaria?
William Slosse William Slosse

Hello all,On 27/03/26, in Kraaiveld in Wingene (Be

30-03-2026 09:53

Lachnum mollissinum ?
Yanick BOULANGER

BonjourVoici des petites fructifications poilues s

27-03-2026 10:47

Stictis cf. friabilis and literature request
Ã…ge Oterhals

I have tentatively identified this Stictis to S. f

28-03-2026 07:55

White Orbilia with allantoid spores
Marc Detollenaere Marc Detollenaere

Hello everybody,Yesterday I found a number of whit

26-03-2026 15:31

Hymenoscyphus ombrophiliformis?
Ã…ke Widgren Ã…ke Widgren

Hello,I found this one in October last year, on r

27-03-2026 15:23

Trichopezizella barbata?
Gernot Friebes

Hi,this Trichopezizella deviates from typical T. b

27-03-2026 15:08

Coelomycete on Cirsium
Gernot Friebes

Hi,I'm looking for help with this coelomycete on C

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White discomycete on Alnus wood
Stefan Jakobsson, 21-01-2023 00:10
On a dead branch attached to a standing Alnus (?)glutinosa there were some 0.3-0.5 mm wide white apos on decorticared wood. The margin and flanks are covered with smooth more or less uncinate hairs. The spores are 5.7-8.5 × 2.1-2.7 µm and the asci 41-50 × 5.8-7.0 µm. Asci seem to have croziers and the iodine reaction is negtive also after KOH pretreatment. The paraphyses have a long VB in the apical cell.

I tried to match this with e.g. Calycina hyalinula but the hairs don't fit in. The temperature in southern Finland had been mostly above freezing point for a week when this was collected yesterday. Are there better suggestions?

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Lothar Krieglsteiner, 21-01-2023 09:05
Lothar Krieglsteiner
Re : White discomycete on Alnus wood
perhaps have a look in the genus Hmatocanthoscypha?
Best regards, Lothar
Stefan Jakobsson, 21-01-2023 10:39
Re : White discomycete on Alnus wood
The hairs, of course, bring Hamatocanthoscypha to mind. But VBs in Hamatocanthoscypha? I found nothing suitable on hardwood.
Lothar Krieglsteiner, 21-01-2023 10:54
Lothar Krieglsteiner
Re : White discomycete on Alnus wood
you are right, I overlooked the vacuolar bodies. Then Calycellina perhaps ?
Hans-Otto Baral, 21-01-2023 17:50
Hans-Otto Baral
Re : White discomycete on Alnus wood
I was also thinking about the VBs but I believe Hamatocanthoscypha is a good choice. What about H. straminella? Look in my folder, it is IKI-, but I thought it should be yellow. For sulphureocintina this is so and also straminella was described as "straminea vel subaurea".
Stefan Jakobsson, 21-01-2023 18:29
Re : White discomycete on Alnus wood
At least last time I collected H. straminella on Alnus three years ago it was very clearly yellow. Then it was growing under a piece of wood against the ground in darkness, so the lack of light does not explain the difference.
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Hans-Otto Baral, 21-01-2023 20:45
Hans-Otto Baral
Re : White discomycete on Alnus wood
Ah you know it, and it was inamyloid, yes? The hairs contain here distinctly rfefractive VBs, not yellow, but I suppose the yellow VBs in the paraphyses were also refractive.

Surely this is something very similar.
Stefan Jakobsson, 21-01-2023 21:44
Re : White discomycete on Alnus wood
It was inamyloid but probably I did not test with pretreatment. Unfortunately I did not save the photos, but the notes say that hairs and paraphyses were more clearly yellow under the microscope than what the photos show.
Hans-Otto Baral, 21-01-2023 23:00
Hans-Otto Baral
Re : White discomycete on Alnus wood
If you use Lugol you must not pretreat with KOH.
Stefan Jakobsson, 22-01-2023 00:27
Re : White discomycete on Alnus wood
Always lugol!