Overnight, very
Whitely, discreetly,
Very quietly
Our toes, our noses
Take hold on the loam,
Acquire the air.
Nobody sees us,
Stops us, betrays us;
The small grains make room.
Soft fists insist on
Heaving the needles,
The leafy bedding,
Even the paving.
Mushrooms, a fungus, tend to be fragile and small, hence “soft fists”. The  alliterative   f s and  s s, produce an appropriately gentle sound. 
 
 ‘Soft fists’ is  oxymoronic . The insignificant appearance of the mushrooms is contradicted by ‘fists’, a dynamic symbol of strength and rebellion.
Mushrooms