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29-09-2022 20:26

Elisabeth Stöckli

Bonsoir, Trouvé à 2'500 m (prairie alpine), tai

05-10-2022 14:35

Viktorie Halasu Viktorie Halasu

Hello,I've found here a Hypoxylon (or Hypomontagne

04-10-2022 18:38

Juuso Äikäs

These little brown, hairy apos were growing on a d

01-10-2022 11:54

DirkW DirkW

chers collègues, anyone out there who could send

05-10-2022 16:09

JEAN CABALION

Bonjour, Qui peut me renseigner sur ce Podostroma

24-10-2021 21:50

Robin Isaksson Robin Isaksson

Hi,Found on Andreaea rupestris sweden.ascomata bl

29-09-2022 17:25

Juuso Äikäs

A finding from a couple days ago: a few white Hyme

29-09-2022 13:34

Marja Pennanen

Dear colleagues, a couple of days ago I found the

13-12-2014 21:47

Rubén Martínez-Gil Rubén Martínez-Gil

Hola a todos. Subo unas imágenes de un disco neg

26-09-2022 15:31

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello,please, can this be something else than Hypo

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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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