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Mot de passe perdu? S'inscrire

22-09-2022 18:14

Andgelo Mombert Andgelo Mombert

Bonsoir, Ascomes sur branche morte attenante de C

26-09-2022 15:31

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello,please, can this be something else than Hypo

25-09-2022 20:04

Elisabeth Stöckli

Bonsoir,Trouvé à 2'500 m (prairie alpin), taille

25-09-2022 14:43

Juuso Äikäs

I deleted my previous misleading post and inspecte

24-09-2022 20:11

Ismael Wind

Found these orange fungi on an old fruiting body o

22-09-2022 22:05

Edvin Johannesen Edvin Johannesen

These yellow, short-stalked apothecia, which turn

22-09-2022 22:48

Bernard CLESSE Bernard CLESSE

Bonsoir à toutes et à tous,J'ai trouvé ce matin

22-09-2022 08:34

Josep Torres Josep Torres

Hola.Unos pequeños apotecios sobre un tronco del

23-09-2022 17:03

Edvin Johannesen Edvin Johannesen

Hi! Found on Stereum sanguinolentum hymenium, Cent

05-12-2019 19:35

Ibai Olariaga Ibarguren

Dear colleagues, I was wondering if anyone could

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White microfungus (airborne contaminant ?) with swellings along its hyphae
Zetti Mario, 16-07-2022 17:01
Hi, I am doing some work with microfungi and during isolation of some Eryphise I have got a bonus colony (isolated in pure form now) which is cotony white and raised by some 4mm from the medium's surface. Could be an airborne contaminant, but maybe it was on the host plant. The colony had a slight scent (faint aromatic maybe...)

Under the microscope, I cannot observe free conidiospores but the hyphae were regularly swollen into thick-walled vesicles (zoospores?). Any suggestions are welcomed. Reminds me in the distance to Phythphtora...
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David Malloch, 16-07-2022 20:35
David Malloch
Re : White microfungus (airborne contaminant ?) with swellings along its hyphae
That will be difficult to identify. The hyphae are producing thick-walled intercalary cells and chlamydospores, but nothing else. It could be a Fusarium, but many other things as well. When I encounter fungi like that, I try a different medium. Maybe V8 or something with a lot of cellulose but not much sugar. Good luck!
Zetti Mario, 17-07-2022 08:07
Re : White microfungus (airborne contaminant ?) with swellings along its hyphae
Thank you, interesting. I was working with a Fusarium oxysporum recently. I have available Sabouroud agar, CZapeK DoX, PDA, Oat Agar and MEA. Which medium do you suggest (Oat perhaps?) - TNX
David Malloch, 17-07-2022 13:45
David Malloch
Re : White microfungus (airborne contaminant ?) with swellings along its hyphae
Those media mostly have a high C/N ratio that may encourage vegetative growth at the expense of sporulation. Perhaps the oat agar would be the best choice.
Zetti Mario, 18-07-2022 08:47
Re : White microfungus (airborne contaminant ?) with swellings along its hyphae
Thank you, Oat Meal and PDA innoculated and I will report back the results.
Zetti Mario, 08-08-2022 18:32
Re : White microfungus (airborne contaminant ?) with swellings along its hyphae
Hello David and everyone.

I managed to find time to reply you back. I managed to get a pure colony on PDA and Oat indeed it was a Fusarium, probably F. oxysporum s.l. (maybe lycopersici) I followed a simple key so dont take this as final determination of course!

I was intrigued by pinkish-peach coloration (images below has enhanced colour)  in the 12 day old colony. They were like soft non encapsulated tissue. Under the microscope they looked like bunch of elongated grapes. Is this characteristic of the species ? Are they the sporodochia ? 


I saw some papers showing this pinkish-peach coloration by F. oxysporum s.l. - e.g.  https://www.frontiersin.org/files/Articles/335707/fmicb-09-00420-HTML/image_m/fmicb-09-00420-g001.jpg

from https://www.frontiersin.org/articles/10.3389/fmicb.2018.00420/full

and this is a good reference paper too
https://repository.naturalis.nl/document/668094
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