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17-03-2026 10:09

François Freléchoux François Freléchoux

Bonjour, Voici la description rapide d'un petit d

17-03-2026 10:40

Martine  Vandeplanque Martine Vandeplanque

Bonjour à tous.Chaque année en mars ou avril, il

12-03-2026 19:44

Enrique Rubio Enrique Rubio

Hi to everybody.Can you give me any suggestions ab

05-03-2026 10:07

Hulda Caroline Holte

Hello, I found and collected this species growing

12-03-2026 15:45

Åge Oterhals

Dear forum,I found this small discomycete on a ver

12-03-2026 16:17

Sylvie Le Goff

Bonjour à tousRécolté dans le 22 en France (ré

11-03-2026 17:36

Michel Hairaud Michel Hairaud

Bonjour, Je cherche des indices  pour cette réc

14-03-2026 13:51

Thierry Blondelle Thierry Blondelle

Hi everybody Under Quercus ilex, i hesitate to na

08-03-2026 14:05

Thierry Blondelle Thierry Blondelle

Bonjour à tous,Sur 3 récoltes supposées de H. l

12-03-2026 14:37

David Wasilewski

These small ascomycota (1-3 mm) ere observed growi

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Minute bright yellow discomycete
Daniel Ghyselinck, 24-01-2012 20:29
Dear all,

I have collected last week this minute (max 0,4 mm) bright yellow discomycete on deciduous decorticated wood.
Paraphyses densely filled with yellow granules.
Spores about 20 – 26 x 4 – 4,5 µm, also with yellow granules, at maturity with 3 septum.
Ascus 8 spored, apex blue in IKI.

Thanks in advance for your suggestions.

Best regards,
Daniel
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  • message #17189
  • message #17189
Hans-Otto Baral, 24-01-2012 20:46
Hans-Otto Baral
Re : Minute bright yellow discomycete
Hi Daniel

I am very happy to see these splendid photos of living elements. This makes identification much easier and clear.

This is Calycellina ochracea, a curious species characterized by these refractive yellowish VBs in the paraphyses, in which it resembles Rodwayella citrinula.

The "granules" in the spores are oil drops. You can easily make the test: When you add KOH the spore guttules will resist but those in the Paraphyses will disappear. They are only seemingly similar.

If you have Cresyl blue you can colour the spore wall in deep lilac. The round conidia formed on the germinating spores are also typical.

The species is not frequent. I would be glad? when you can tell me the region where you collected it. No idea of the host tree?

Zotto
Gernot Friebes, 24-01-2012 20:48
Re : Minute bright yellow discomycete
Hi Daniel,

looks similar to Calycellina ochracea.

Best wishes,

Gernot

PS.: To slow :-(
Daniel Ghyselinck, 24-01-2012 20:56
Re : Minute bright yellow discomycete
Thanks a lot Zotto,

I will immediately make the test with KOH and Cresyl blue, and post the result on the forum.

It was collected in Belgium, Province Brabant Wallon, near Nivelles (Monstreux - Bois du Planti) on 15.01.2012.

Unfortunately no idea of the host, it was found by my wife (as usual, she founds everything !), in a pure deciduous mixed forest, and I just got a small piece of rather rotten wood.

Daniel
Daniel Ghyselinck, 24-01-2012 21:42
Re : Minute bright yellow discomycete
Hi Zotto and Gernot,

The VBs in the paraphyses effectively disappears in KOH, while the oil drops in the spores did not.

And the spores became deep lilac in Cresyl blue.

It's a very curious and interesting species, indeed !

Daniel
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