Accès membres

Mot de passe perdu? S'inscrire

28-03-2020 19:45

Muñoz González Guillermo

Bonsoir,Je voudrais connaître votre opinion sur c

01-04-2020 14:15

Castillo Joseba Castillo Joseba

Me mandan el material seco, solo un ejemplar   en

01-04-2020 11:34

Iosif Sandor Iosif Sandor

Hi forum, Sorry if i am somehow out of the topic

31-03-2020 23:57

Garcia Susana

Hola, He encontrado estos pseudotecios en una ram

26-03-2020 09:57

Josep Torres Josep Torres

Hola.Un parásito para identificar sobre Xanthoria

01-04-2020 09:09

Savic Dragisa

HI, I found again something unusual and unknown to

26-03-2020 18:23

Malcolm  Greaves Malcolm Greaves

How many Podospora are there with four spores per

31-03-2020 11:56

Garcia Susana

Hola, He encontrado estos ascomas sobre una peque

25-02-2020 05:19

Ethan Crenson

Hello all, I was in California and found this sm

31-03-2020 16:56

Ethan Crenson

Hello all, I incubated some deer dung from an NYC

« < 1 2 3 4 5 > »
Pyrenomycetes?
Mirek Gryc, 24-02-2020 20:05
Hi
Unfortunately, but my knowledge is too scanty about them to name this collection (
1) I don't see any gelatinous cover on the spores.
2) I also didn't notice germ slit.
3) KOH negative.
4) Substrate unknown (not excluded Populus sp.)?

I measured only mature spores (brown)
(8.9) 9.1 - 10.2 (10.4) × (3.9) 4.1 - 4.6 (4.7) µm
Q = (1.9) 2.1 - 2.3 (2.4); N = 11
Me = 9.6 × 4.4 µm; Qe = 2.2


10.23 4.44
  9.93 4.44
  9.11 4.07
  9.25 4.74
  9.78 4.61
  9.34 3.94
  9.28 4.46
  9.67 4.37
10.38 4.45
  9.52 4.16
  8.90 4.34


Thank you in advance for your help.
Mirek

  • message #61705
  • message #61705
  • message #61705
  • message #61705
  • message #61705
  • message #61705
  • message #61705
  • message #61705
  • message #61705
  • message #61705
  • message #61705
  • message #61705
  • message #61705
Josep Torres, 24-02-2020 21:31
Josep Torres
Re : Pyrenomycetes?
Hola Mirek, estas esporas me recuerdan a Nemania, hasta algunas veces puede ser alguna variedad de Nemania serpens , aunque las medidas de las esporas se quedan un poco cortas. Esto sería importante conocer las medidas del dispositivo apical.
Dejo un abrazo del género:

http://pyrenomycetes.free.fr/nemania/keydir/dichotomickey.htm

Saludos cordiales.
Mirek Gryc, 25-02-2020 10:06
Re : Pyrenomycetes?
Hi Josep
Thanks to you, I narrowed down the circle of suspects. At first I hesitated between Nemania and Hypoxylon.
Nemania serpens was initially rejected from the circle of suspects, although the macro was very similar. The dimensions of the apical apparatus in this genre are too large.
In my:
Me = 2.7 × 1.8 µm; Qe = 1.5

2.60 1.92
2.67 1.78
2.68 1.99
2.59 1.65
2.85 1.78


I considered Nemania atropurpurea. However, I have comments on the color of the spores. I would rather consider them light brown, whereas N. atropurpurea should be dark brown ??


I looked at all the possibilities and came to the conclusion that N. serpens is probably the most suitable for my collection.
However, taking into account the fact that the dimensions of my collection, despite being within the limits of this species, are however close to their limit values, therefore I should consider mine as:
Nemenia serpens sensu lato !?


I also measured the spores in KOH and they come out a bit bigger ??


I also measured the thickness of the spore wall. It turns out that they have> 0.5um which according to Czech Mykol can be a decisive feature in distinguishing these species. Nemania atropurpurea should have thinner.


Thank you and best regards
Mirek

  • message #61722
  • message #61722
Jacques Fournier, 25-02-2020 19:07
Jacques Fournier
Re : Pyrenomycetes?
Hello Mirek and Josep,

this cannot be N. serpens owing to the euamyloid apical apparatus.

It does not fit well either N. atropurpurea, whose ascospores are darker brown and have a short but conspicuous germ slit.

I would place this fungus around N. colliculosa if the perithecial size fits, but a small-spored form.

Nemania species in the serpens group are often difficult to sort out and additional characters like texture (more or less carbonaceous), diameter of perithecia, colour of entostroma are required.

A good marker is that N. colliculosa is less carbonaceous than N. serpens and N. atropurpurea.

I advise you to read the monograph by Granmo et al. (1999) Sommerfeltia 27. Sorry, I don't have it as a pdf file.

Good luck!

Jacques
Mirek Gryc, 25-02-2020 19:35
Re : Pyrenomycetes?
Hi Jacques
Thank you very much for valuable suggestions.
This is my first Nemania collection which I microscoped so please forgive me for not providing all the features needed for identification. Beginnings are difficult and especially in such a difficult kind.
A comparison with N. serpens and N. atropurpurea at present is not possible. I don't have fruiting bodies for these species, but in time I'll try to make up for these shortcomings.
I downloaded the monograph on Granmo et al. (1999). if someone was also interested, it is available at:
https://www.researchgate.net/publication/259034689_The_genus_Nemania_sl_Xylariaceae_in_Norden

Regards
Mirek