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18-02-2019 19:45

Patrice TANCHAUD

Bonjour récolte sur épicéa, spores 62-83 x 3-3

20-02-2019 08:22

Patrice TANCHAUD

Sur épicéa. Spores 7,5-10 x 2,5-3 µm. Merci d'

19-02-2019 22:35

BERNARD CLESSE BERNARD CLESSE

Sur bourgeon pourri de peuplier du Canada, caché

19-02-2019 23:07

Per Marstad Per Marstad

I have found this on Sorbus aucuparia, in Norway.I

19-02-2019 13:43

Patrice TANCHAUD

Sur Abies. Spores 7-9 x 0,8-1,2 µm. Peut-être ve

19-02-2019 19:49

Blasco Rafael Blasco Rafael

Hola, alguna idea de a que genero debo mirar ???,

19-02-2019 19:46

Per Marstad Per Marstad

I have found this on Fagus, in Norway.Size : 2 - 3

19-02-2019 17:06

Laurens van der Linde Laurens van der Linde

hello i found this specie on a Berberis vulgaris 

05-12-2016 14:44

Malcolm  Greaves Malcolm Greaves

I am trying to find out why one of the British fun

19-02-2019 14:41

Bernard Declercq Bernard Declercq

Hi, Following collection was made on fallen twig

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Yellow Nectria (aff. pallidula?)
Edvin Johannesen, 18-01-2019 22:14
Edvin Johannesen
Dear all,

This nectriaceous species was growing erumpent on twigs of old, but living plum tree (Prunus). Ascospores measure ca. 13 x 4-6 microns, and become warted and 1-septate at maturity. Is this sufficient for identification or does it need further studies?
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Christian Lechat, 19-01-2019 06:20
Christian Lechat
Re : Yellow Nectria (aff. pallidula?)
Hi Edvin,

maybe your fungus is Bionectria. Vertical section through ascomatal wall could be very useful as well as the reaction in KOH and lactic acid. Please, check if there is an asexual state on the substrate or around the stromata, which should be clonostachys-like.

All the best,

Christian
Edvin Johannesen, 19-01-2019 11:36
Edvin Johannesen
Re : Yellow Nectria (aff. pallidula?)
Thanks, Christian. Do you mean cotton blue or plain lactic acid (which I do not have)? What to look for? Do you have a good article on Bionectria? I have limited access to literature on the internet.

Best regards,

Edvin
Edvin Johannesen, 19-01-2019 13:47
Edvin Johannesen
Re : Yellow Nectria (aff. pallidula?)
The ascomatal wall appears two-layered; an outer yellow and an inner hyaline layer.  I have also tested iodine reactions. Neither Barals (alone) or Lugol after pre-treatment with 3% KOH gave any detectable staining.
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Edvin Johannesen, 19-01-2019 13:49
Edvin Johannesen
Re : Yellow Nectria (aff. pallidula?)
Apart from a few structures associated with the ascomata, an anamorph is not evident. Do these images show clonostachys or is this something else?
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Christian Lechat, 19-01-2019 15:35
Christian Lechat
Re : Yellow Nectria (aff. pallidula?)
you should take a look at Schroers 2001 A Mponograph of Bionectria Studies in Mycology 46.

Regards,

Christian
Edvin Johannesen, 19-01-2019 15:38
Edvin Johannesen
Re : Yellow Nectria (aff. pallidula?)
Thanks, again. I will see if I have access. I am thinking now maybe B. ochroleuca, but need to check further.

Regards,

Edvin