Detailed simultaneous radiative transfer-statistical equilibrium calculations have been performed for lithium in atmospheres of solar metallicity G-M dwarfs and subgiants .
Model atmospheres of stars with 3500 \leq T _ { eff } \leq 6000 K , 3.0 \leq \log g \leq 4.5 have been considered .
The behaviour of level populations , source functions and curves of growth for the lithium doublet at \lambda 670.8 nm and two subordinate lines of astrophysical interest ( \lambda 610.3 nm and \lambda 812.6 nm ) are discussed .
For the coolest atmospheres of our grid we find that the dependence of non-LTE equivalent widths and profiles on gravity is very weak .
The computed LTE and non-LTE curves of growth are given in tabular form .

Key words : Line : formation – Line : profiles – Stars : abundances – Stars : late type