Lion’s mane mycelium is much finer and less opaque than other commonly grown gourmet fungal species.
The mycelium will often thicken and develop an opaque, white layer where it makes most contact with fresh air. This is due to the formation of primordia, this layer of primordia can be removed prior to using the grain spawn.
Maturing grain spawn will often produce yellow, liquid metabolites which are a natural byproduct of the mycelium.
Due to the fine structure of lion’s mane mycelium recently colonised grain spawn will often appear underdeveloped after being shaken, however the grains will remain inoculated and ready for use.