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22-02-2020 16:41

Robin Isaksson Robin Isaksson

I wonder if this one is Hysterobrevium constrictum

05-02-2015 11:21

Zoltan Lukacs Zoltan Lukacs

Hi all, has someone a PDF of Mycographia, seu Icon

21-02-2020 20:43

Thorben Hülsewig

Hi there,I found this fungus on a branch (probably

22-02-2020 07:20

Mirek Gryc

Hi.It is a popular species but I have not been abl

21-02-2020 20:33

Rubén Martínez-Gil Rubén Martínez-Gil

Hola a todos. Subo unas fotos de un Ascobolus que

22-02-2020 08:22

Vasileios Kaounas Vasileios Kaounas

First time i see so little Geoglossum, 1 cm. Beca

21-02-2020 14:47

Savic Dragisa

Hi to all, I need help identifying this lichenicol

14-02-2020 15:27

Savic Dragisa

HiThey're not fungi (but who knows, maybe they are

21-02-2020 11:48

Michel Hairaud Michel Hairaud

Bonjour / Hi to everyone Le 1er numéro 2020 d'As

30-03-2013 21:25

François Valade François Valade

HelloA small yellow Bryoscyphus sp? on moss, Pleur

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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.