I'd be very careful with anything fungal on my body. Last thing I'd want is a fungal infection in my lungs or something dreadful like that. This looks like the classic human folly were we get blinded and overhyped by the usefulness of the technology and minimize and discard the side-effects.
Mycelial sheets are formed of filaments (hyphae) that have grown as a result of a spore / multiple spores growing, which are 'fruit phase' of the fungus.
The mycelial sheets are rendered 'inert' through one of an option of processes (for example baking it).
A clearer visualisation of the materials here: the mycelial sheets used in research / production are as to spores as a plank of apple tree wood is to apple seeds.
When you're working with the wood you do need to be cautious of the dust, but you don't need to be concerned about apple seeds sporadically appearing.
The earth is absolutely covered in fungus and fungus spores. I don't think a product manufactured from stabilized reishi mycelium would be anything to worry about.
And is based on cordyceps mushrooms. Which are actual parasitoids of insects. They're the famous "mind-control" mushrooms you see in every nature documentary that features ants in the Amazon
Reishi on the other hand... eats trees.
For some possibly useful context. When wood (lignan) first evolved there was nothing that could break it down. And for possibly thousands of years much of earth became "polluted" by dead trees that couldn't be broken. It was fungi that finally evolved ways to decompose it. They're obviously really good at it at this point, but hopefully that gives you a sense of just how specialized an organism has to be to primarily live off of wood
The use of “skin” in the title has nothing to do with the human body. This is creating a substrate to replace the “green boards” we use now. It’s composed of layers of “mushroom skin” to place traces and components on.
