  The possibility of explanation of accelerated expansion of the Universe by
tachyonic scalar fields which homogeneously fill the world is discussed. The
dependences of potential and kinetic term on scale factor are deduced for the
case of quintessential and phantom dark energy with generalized linear
barotropic equation of state. The possibility to distinguish the tachyonic
scalar field as dark energy from other scalar field models, especially from
classical scalar field, is analyzed.
