The bluing reaction is Oxidisation of the psychedelic active alkaloid Psilocin. This species contains a lot of Psilocin (as well as the stable Psilocybin), so it does stain blue when touched, but also while getting old or being naturally damaged. Also the bluing is sometimes a more greenish tone and so the LBM is not so brown anymore :)
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Its interesting some were growing out of branches too.
Actually the branches are the substrate or can be the substrate. There are lots of them coming out of big logs.
They are typically growing "in a row" because underneath the grass and moss is a buried log :)
Interesting it must be really broken down old wood.