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16-07-2025 17:34

Bernard Declercq Bernard Declercq

Hello,I have trouble distinguishing above mention

14-07-2025 11:20

Michel Hairaud Michel Hairaud

Bonjour, Voici une espèce de  (?) Hyaloscyphace

15-07-2025 13:27

Angel Pintos Angel Pintos

Hello, does anyone have access to the following ar

16-01-2023 21:31

Riet van Oosten Riet van Oosten

Hello, Nearby the find of Calycina claroflava on

14-07-2025 17:55

Yanick BOULANGER

BonjourAutre dossier laissé en suspendJe viens de

14-07-2025 11:17

Yanick BOULANGER

BonjourJ'ai un dossier Jackrogersella qui est rest

14-07-2025 15:52

Gernot Friebes

Hi,I wanted to share this collection on Rubus idae

14-07-2025 13:37

Gernot Friebes

Hi,do you think this collection could be R. ulmari

25-02-2023 18:36

Elisabeth Stöckli

Bonsoir, Trouvé sur un tronc de Salix recouvert

12-07-2025 16:45

Thierry Blondelle Thierry Blondelle

Bonjour à tous,J'avais d'abord pensé à des stro

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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