A friend of mine in Los Angeles recently put a petri dish with some mold-friendly substrate under a vent for two days, and a whole rainbow of mold species grew on it.

What are the different mold species present on this dish? Are any of them dangerous to human health?

  • $\begingroup$ you need to give a lot more information and if possible take pictures with 50x magnification of each type in your sample. $\endgroup$ Feb 17 at 6:10
  • $\begingroup$ I'm not sure the OP can give "a lot more information" except maybe what the "mold-friendly substrate" was, but I think an answer linking to a resource for common household mold species would be a wonderful and helpful answer. +1 for home experiments! $\endgroup$
    – uhoh
    Feb 17 at 7:39
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    $\begingroup$ @trondhansen - I am happy to give any other information that I have and that might be relevant, if you tell me what you are looking for. I did not take the picture, and my friend does not have a microscope, so I cannot easily get you 50-times-higher-resolution pictures. I imagine some "best-guess" answer might have to do if there are various mold species with similar phenotypes. $\endgroup$
    – Obie 2.0
    Feb 17 at 7:51
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    $\begingroup$ The wet pink ones are likely to be either a yeast or something like Serratia marcescens. We would need microscope pictures of stained samples from the others to attempt ID. Filamentous fungus is about as close as you can get otherwise. Huge range to choose from... $\endgroup$
    – bob1
    Feb 18 at 22:38


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