Hi

By the way, I am replying based on some knowledge of autoclaves and
pressure cookers. Perhaps someone who has actually used a pressure
cooker in flasking orchid seeds can confirm what I say or add to it?

I'm using a pressure cooker for more than one year now, 20 min at full
pressure, never got any fungus (and I autoclaved more than 400 bottles). But
I never sowed directly after autoclaving, I always waited one week to see,
if anything is starting to grow.

Philipp