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03-09-2020 19:34

Mirek Gryc

HiAs in the title: on the parts of the Viscum albu

17-09-2020 11:07

Joop van der Lee Joop van der Lee

Normally Pilobolus are found on horse dung but thi

22-09-2020 18:27

Mirek Gryc

HiPlease give me a hint.Mirek

22-09-2020 15:22

Savic Dragisa

Hello everyoneI need help with this anamorph. Lea

20-09-2020 18:11

Castillo Joseba Castillo Joseba

De esta mañana  sobre madera posiblemente de Fag

21-09-2020 08:57

Castillo Joseba Castillo Joseba

De ayer en madera de FagusPelos hasta 1533µA ver

21-09-2020 12:36

Castillo Joseba Castillo Joseba

De ayer en rama de avellano (Corylus),   crfeo q

22-09-2020 12:15

Joop van der Lee Joop van der Lee

Found on dung pallets of roe deer.No living sprang

21-09-2020 15:55

Andgelo Mombert Andgelo Mombert

Bonjour à tous, Avec Gilbert, nous recherchons l

21-09-2020 20:34

Marcel Heyligen Marcel Heyligen

Hello anybodyI need help with the determination o

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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.

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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.

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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.
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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.