This species represents the only known Boletus  from the Hawaiian Islands.  And
it is collected where you would never expect a respectful bolete to grow,viz.  in black
sand under Casuarina  within 50 m of the ocean!  The species was first described from
Malaysia where apparently it was collected on rotten wood.  Boletus xylophilus  is one
of a small but select group of species in the genus with small, ellipsoid basidiospores.