Very interesting post, thanks for posting!
Trich spores are everywhere, and they will appear as a fast growing white mycelium patch that turns dark, forest green when it sporulates. If you leave a cup of coffee out for a couple of weeks, watch what moulds grow on it. If a dark green mould grows which spreads to take over the surface of the liquid (patching over other moulds in the process) then that might be Trichoderma.
The problem is that there are also green spored moulds that look completely identical to the naked eye that are very poisonous, causing respiratory illnesses. The only way to tell them apart for certain is under a powerful microscope.
So i'd be very careful before growing just any green mould on corn meal. You're likely to germinate a whole bunch of molds on the corn meal and some of them could be be dangerous.
A far safer way of doing it would be to take cornmeal (or brown-rice flower, wild bird seed or rye grain), mix it with water so that it's just moist without dripping wet (squeeze the excess moisture out), pile it into a jam jar, close the lid and seal it off.
Put the jar in a dark place and wait for the molds inside to grow. In theory, a whole bunch of white, green, black, grey and pink molds will grow from spores throughout the jar. Over time though, the dark green Trich should compete favourably and colonise the entire jar.
You can then open up the jar when it has been fully colonised by the green Trich. And hopefully by then, the pathogenic molds will have been killed off. You can smell the jar, make sure it doesn't smell sickly or sweet. If it does, seal it and chuck it. If it smells like coconut or mushrooms, it could be safe to use.
(Note italic emphasis, playing with random molds can be dangerous, don't consider this a foolproof method, i take no responsibility for giving people advice on how to grow mold!)
That would be a far safer way to grow Trich in my opinion, if the alternative is just to grow it openly.
Mold does need to grow on something organic though, and i don't think it would work for inert mediums. But the whole point of inert mediums is to avoid fungi in the first place so i don't know if Trich would help anyway.
But if what they say about Trich is true, then it could work well for bark...
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