Accès membres

Mot de passe perdu? S'inscrire

25-02-2023 18:36

Elisabeth Stöckli

Bonsoir, Trouvé sur un tronc de Salix recouvert

05-07-2025 12:38

Åge Oterhals

I found this pyrenomycetous fungi in pine forest o

01-06-2025 09:37

Charles Aron Charles Aron

Hi All, I found this Octospora growing with liver

06-07-2025 19:36

Castillo Joseba Castillo Joseba

me mandan el material de Galicia (España) recolec

07-07-2025 19:22

David Chapados David Chapados

Hi,Does anyone know what could this anamorph be?ht

02-07-2025 18:45

Elisabeth Stöckli

Bonsoir,Sur feuilles d'Osmunda regalis (Saulaie),

04-07-2025 20:12

Josep Torres Josep Torres

Hello.A fungus growing on the surface of a trunk o

20-06-2025 08:33

Josep Torres Josep Torres

Hello.Small, blackish, mucronated surface grains s

28-06-2025 16:00

Josep Torres Josep Torres

Hello.A tiny fungus shaped like globose black grai

04-07-2025 12:43

Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia (España) 

« < 1 2 3 4 5 > »
Rustroemia on ivy leaf
Charles Aron, 14-02-2020 18:19
Charles Aron

Hello everyone. My first contribution to the forum!


Below is a description of a cup fungus looking like a Rutstroemia which I found on a dead ivy leaf but I'm not aware of any of this genus which occur on this substrate.


Regards,


Charles.


Rutsroemia on ivy leaf, Refail Fields, Pentraeth, N. Wales, 11/2/19


Asci: 80x7, 87x8, 90x8, 87x8, 89x8, 87x8.5, 78x7, 90x8,


Spores: 12.5x4, 2x3.5, 12x3.7, 12x4, 13x4.8, 12x3.5, 12.4x3.7, 12x3.9, 12x4.,


Paraohyses tips: 4, 3.3, 3.5, 4,


Excipulum textura globosa-cells thick walled. C 10 across.


FB 3 x 2mm. Cup-shaped. Hymenium bright yellow-brown. Excipulum paler, minutely furfuraceous. Stipe short-c0.5mm.

  • message #61511
  • message #61511
  • message #61511
  • message #61511
Raúl Tena Lahoz, 14-02-2020 18:27
Raúl Tena Lahoz
Re : Rustroemia on ivy leaf
Hi Charles, welcome to Ascofrance!
It is a Moellerodiscus, from the M. lentus complex. We found it also on ivy leaves in France and Spain. Asci seem to arise from croziers, do they?
Cheers,
Raúl
Hans-Otto Baral, 14-02-2020 18:30
Hans-Otto Baral
Re : Rustroemia on ivy leaf
Hi Charles

welcome to the forum!

Your fungus seems to be a Moellerodiscus, related to M. lentus. A difficult genus, not easy to give advice. It seems the asci arise from croziers, perhaps you can show this by a closeup on the ascus base? Did you test the ascus apex with iodine (Lugol)?

Zotto
Charles Aron, 14-02-2020 18:39
Charles Aron
Re : Rustroemia on ivy leaf

Many thanks for this. I'm not familiar with Moellerodiscus. So it would be fair to call it Moellerodiscus lentus agg.? Will have a look at the asci in iodine.


Charles.

Charles Aron, 20-02-2020 19:27
Charles Aron
Re : Rustroemia on ivy leaf

Hi raul& Zotto,


I've had a look at the dried material and croziers are clearly visible. The ascus pore blues in Melzer's after treatment with KOH and the subhymenium turns reddish then  brownish in Baral's.


Marginal hairs are quite distinctive and up to bout 50 long.


Very few British records under M. lentus. I was wondering if it has a somewhat southern distribution in Europe?


Regards,


Charles.

  • message #61618
  • message #61618
  • message #61618
  • message #61618
  • message #61618
Hans-Otto Baral, 20-02-2020 19:34
Hans-Otto Baral
Re : Rustroemia on ivy leaf
Good!

I am actually unaware of hairs in M. lentus, and i know this group of species with an apical ring reacting strongly only at the lower end.

So I am quite undecided.
  • message #61619
Charles Aron, 20-02-2020 22:14
Charles Aron
Re : Rustroemia on ivy leaf

Hi Zotto,


Many thanks for your response. I'll be on the lookout for more fresh material!


Charles.