Hello all Mushroom Fanatics! I wa splanning of doing some trials with Portobello however, on D-day, I realised I had run out of straw so I only managed to produce one small kit (approx. 2kg). Colonised like a wonder, cased it with 50/50 plus and all seems well. Recently, I noted that the surface of the casing is covered with what looks like an infinity of pins...but very small (maybe 1mm in diameter). Would you know what is going on?