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04-07-2025 20:12

Josep Torres Josep Torres

Hello.A fungus growing on the surface of a trunk o

20-06-2025 08:33

Josep Torres Josep Torres

Hello.Small, blackish, mucronated surface grains s

28-06-2025 16:00

Josep Torres Josep Torres

Hello.A tiny fungus shaped like globose black grai

04-07-2025 12:43

Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia (España) 

03-07-2025 18:40

Castillo Joseba Castillo Joseba

me mandas el material seco de Galicia (España) re

03-07-2025 20:08

Francois Guay Francois Guay

I found this interesting yellowish asco growing on

01-07-2025 23:37

Josep Torres Josep Torres

Hello.A Pleosporal symbiotic organism located and

02-07-2025 17:26

Yanick BOULANGER

BonjourRécolté sur une brindille au fond d'un fo

02-07-2025 18:45

Elisabeth Stöckli

Bonsoir,Sur feuilles d'Osmunda regalis (Saulaie),

02-07-2025 09:32

Nicolas VAN VOOREN Nicolas VAN VOOREN

Hello, bonjour.Here is the paper I'm searching for

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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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