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26-08-2025 16:34

On Robinia!
Marcel Heyligen Marcel Heyligen

Out of curiosity, because it's just so beautiful!

25-08-2025 17:37

Petit asco indéterminé
François Freléchoux François Freléchoux

Bonjour,Nous avons trouvé samedi dernier à l'ét

24-08-2025 21:30

Orbilia dryadum ?
Ethan Crenson

Found yesterday in a New Jersey park.  An Orbilia

24-08-2025 21:59

Podospora
Edmond POINTE Edmond POINTE

Bonsoir amis mycologues,Trouvé sur crottin de che

21-08-2025 18:09

Semble Thecotheus
Edmond POINTE Edmond POINTE

Bonjour Amis mycologues.Trouvé sur crottin de che

22-08-2025 18:10

Protocrea ?
Ethan Crenson

Hello everyone,  I found what I think might be P

20-08-2025 19:04

Adelphella babingtonii - lacking much brown pigment
Ethan Crenson

Hello, This asco was found on the same wood as my

22-08-2025 08:41

Literature request
Masanori Kutsuna

Hello.Can anyone help me to get this article?Liu H

21-08-2025 02:18

Helicoma muelleri?
Stefan Jakobsson

On a necrotic section of a living Tilia cordata I

18-08-2025 23:15

S.vitreola?
Zoe Vélez Zoe Vélez

Hola foro, gracias por aceptar la creación de mi

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Discomycete with muriform(?) spores on Sambucus racemosa
Edvin Johannesen, 06-10-2020 14:04
Edvin Johannesen
Hi!

I am struggling with this tiny disco with a grey hymenium and a white, downy rim. I have only two apothecia, so not much to play with.  Asci measure approx. 200 x 10 microns (in water) - shorter (ca. 150) in Lugol.  Spores ca. 17 x 9-10 microns. They are either muriform or multiguttulate - it's hard to tell - and hyaline. The entire ascus "cap"is reddish-brown in Lugol (no pre-treatment with KOH).  Paraphyses filiform, ca. 1 micron thick.  Asci appear to be 4-spored or else 4 spores are consistently aborted.

Suggestions appreciated.  Thanks.
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Edvin Johannesen, 06-10-2020 14:05
Edvin Johannesen
Re : Discomycete with muriform(?) spores on Sambucus racemosa
Microscopic details in water
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Edvin Johannesen, 06-10-2020 14:06
Edvin Johannesen
Re : Discomycete with muriform(?) spores on Sambucus racemosa
In Lugol
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Martin Bemmann, 06-10-2020 15:44
Martin Bemmann
Re : Discomycete with muriform(?) spores on Sambucus racemosa
Hi Edvin,

perhaps a lichen. There seem to be enough algae visible on the macrophoto.

regards

Martin
Hans-Otto Baral, 06-10-2020 17:06
Hans-Otto Baral
Re : Discomycete with muriform(?) spores on Sambucus racemosa
I cannot see pic 3 and on the other I do not see algae. The red IKI reaction of the apical ring is interesting. I suggest to test also IKI after KOH, whether the ascus wall also reacts.

The thin paraphyses seem strongly branched.

Cryptodiscus muriformis resembles somewhat your specimen, including the 4-spored asci, but the spores are much larger and the apos orange. Here the entire ascus wall reacts, but also a distinct apical ring.

Important would be a section to study the margin, and perhaps also the presence of algae.

The large oil drops mask the cell walls. If you mount in MLZ or CB, or CR, you will better see the walls.
Edvin Johannesen, 06-10-2020 17:38
Edvin Johannesen
Re : Discomycete with muriform(?) spores on Sambucus racemosa
Thanks to both for your comments. It turns out that this one has been collected several times along the coast of Norway. A paper is in progress. I think one of the author will comment here. Sambucus is a new host/substrate.