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31-08-2025 17:32

Michel Hairaud Michel Hairaud

Bonjour, Pas d'identité trouvée pour cette réc

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Thomas Flammer

I have found a Rutstroemia on abt. 2000 m on Alnus

29-08-2025 19:04

Thomas Flammer

Spores 21.2 - 26.2 x 8.3 - 11.3 µm - Q: 2.20 - 2.

30-08-2025 18:29

Joaquin Martin

Hi,I found this undetermined ascomycete on broadle

28-08-2025 17:24

Thomas Flammer

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29-08-2025 05:16

Francois Guay Francois Guay

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Mollisia on Fagus
Raúl Tena Lahoz, 28-03-2012 19:17
Raúl Tena LahozHi all!
A friend has collected this Mollisia on Fagus wood (I have not checked micro anatomy). I attach some pics of it in a pdf file. I cannot find a good species with Andreas´ or Zotto´s keys (Helotiales 2005).
Spore range: (6,5)8-10,5(11,8) x 2-2,5. Oil 0.
Asci range: 60-77 x 5,5-6,8. Euamyloid.
Paraphyses and excipular cells do not stain yellow or violet in KOH (5% aprox.).
More features on the pdf. 
Any idea? 
Raúl
Hans-Otto Baral, 28-03-2012 20:42
Hans-Otto Baral
Re : Mollisia on Fagus
Hi Raul

why not say Mollisia cinerea to this?

Zotto
Raúl Tena Lahoz, 28-03-2012 22:46
Raúl Tena Lahoz
Re : Mollisia on Fagus
Hi Zotto 
I discarded cinerea due to spore width. You both say 2,5-3 and I saw more 2-2,5, but I see in "Mollisia cinerea cf., HB 1241" that you have (1,5)2-2,5(-3). That´s a good cinerea?
Raúl
Hans-Otto Baral, 28-03-2012 23:18
Hans-Otto Baral
Re : Mollisia on Fagus
I must admit I haven't a good concept of cinerea. But if one admits a certain variability, I think this here could be named so.
Zotto
Raúl Tena Lahoz, 29-03-2012 10:44
Raúl Tena Lahoz
Re : Mollisia on Fagus
Ok Zotto, thanks a lot!
Andreas Gminder, 03-04-2012 16:39
Andreas Gminder
Re : Mollisia on Fagus
Hello Raúl,

the micoscopical details say indeed M. cinerea. I wouldn't lay to much emphasis on the differences in spore width.
But there are other things which bother me a little, e.g. the macroscopical appearance. My imagination of a (typical) cinerea is a ash grey hymenium and a growth of many apothecia in direct contact, so that they difforme each other.
Also the rich subicular hyphae do not suite my concept of M. cinerea.

My idea would be, whether this could not be M. lividofusca. Though the subhymenium of the examined apothecium is hyaline. If have noticed several times, that sometimes within a collection you need to examine several apothecia, until you have one with an obviouse brownish subhymenium. So may be you can examine some more apothecia (best is a cut through the middle axe, and then observe in KOH 3% that will show the pigmented areas the best).

Spore measurements would also fit better to M. lividofusca, especially when the loger spores up to appr. 12 µm would be not so rare that you have to put that value in brackets.

best regards,
Andreas
Raúl Tena Lahoz, 04-04-2012 10:15
Raúl Tena Lahoz
Re : Mollisia on Fagus
Hi Andreas
Thanks for your opinion. I checked 6 apos and I did not notice brownish subhymenium. About the subicular hyphae, they were scanty and only present at the apothecial base. I attach more photos of the subhymenium.
I send to your mail a link with the hole micro pictures.
Raúl
  • message #18080
  • message #18080
  • message #18080
Andreas Gminder, 04-04-2012 10:26
Andreas Gminder
Re : Mollisia on Fagus
Hello Raùl,

thanks a lot.
So M. lividofusca seems to be no opinion and I would leave the collection as M. cinerea agg., due to missing better choices ;-))

best regards,
Andreas