rhizoid/filamentous colonies on plate count agar - (May/18/2008 )

Hi everyone!I'm new on this post!First of all I want to sorry for my english that is not very good..I hope you'll understand me...
I'm writing because yesterday on a plate count agar I saw a rhizoid /filamentous colony...and I don't know what it can be...I have searched on books and atlas but I have found nothing! Thanks for any suggestions....Bye Bye

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Can you tell us more about the colonies' phenotype? Have you looked at them in the microscope? From which substate did you isolate them?

If you are talking of Bacteria my first guess would be: Bacillus (or Actinomycetes)

Or are you talking about fungi?

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Hi!thanks for your reply!They are not fungi because they don't grow on sabouroud and teir structure is really different!I Have seen them on a plate count agar!They grow very fast and I have seen them at the mycroscope:I can say that they form "big"filamentous structures....

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My tip still is some Bacillus (cereus or filiformis)....but :

There are lots of fungi not (or badly) growing on sbouroud agar! (I dont know who started this legend)

To decide if you are culturing bacteria or fungi you will have to look at them in the microscope and basically you will have to differentiate procaryotic (bacteria) or eucaryotic (fungi)!
Anamorphic fungi usually form hyphae and if you are lucky you find some conidiogenous cells at the "end" of the hyphae so you can determine your isolate.
Yeasts (fungi too) are easily to determine if you can see the "typical" yeast stage with bugging sites, but there are yeasts forming a mycelium or pseudomycelium.
Bacteria are often smaller than the previous, but have no cell wall and no nucleus.

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