Creating mycelium composites using plugs

Hi

My name is Noor Roelen.
I am investigating the influence of different substrates on a number of material properties of mycelium-based composites. I have used mycelium plugs of Trametes versicolor and flax and hemp as substrates.

A week ago I started the mycelium cultivation, but there are still no fungal threads visible. Does the mycelium need more time to grow or should I already see something?
If you have any remarks or ideas, feel free to let me know.

Kind regards