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Hey BoO, how's it going. I have grown out a lot on agar. I am growing out Ecuador righ now on Malt agar. It is covering about 1/4" surface area (in a radial fashion) per day. So I would say yes, very vigorous. I had a mexi cub strain that would cover a petri dish in three days flat. It's a great way to expand your mycelium for either wedge or liquid innoculation techniques. The other huge advantage is that you can visualy see the growth rate of your cultures and pick one that is most vigourous. This results in faster colonizing and large fruit bodies in my experience. I can send you a scan of my plates if you like.
Hey BoO! I have never seen what you have described, but then I dont use petris. I mainly use baby food jars. Bluing would tend to make me think that is has been physically damaged in some way. 02 levels are complacently important when talking colonization. The only time a fungus really needs lots of O2 is when fruiting is to be induced. I have never had a problem with lack of airation when colonizing agar. Did you drop the plate or something?
Dan, you basically repeated what I said. Injury, typically causes bluing. However starving (I didn't say "lots") of 02 (an unlikely cause in this instance) will also cause bluing. Try sealing a colonizing mason some time and you will see, hence filter disks.
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