The properties of galaxies change in a systematic way with galaxy mass, 
with redshift and with environment. Understanding which factor is the most 
important in driving galaxy evolution is one of the main goal of the
astrophysics. It is well known that several galaxy properties are largely 
determined by the stellar mass.
I will characterize the galaxy stellar mass function in different global 
environments (clusters, groups, field), at intermediate redshift. 
Then, I will present in detail the mass function of galaxies in clusters, 
as a function of the galaxy morphological type, and how it evolves 
between z=0.8 and z=0. This results that has several far 
reaching implications for the mass assembly, the mass segregation with 
environment and the morphological evolution of galaxies. I can show 
how strong is the evolution of the total mass function, and of the mass 
function of EACH morphological types (ellipticals, S0s and late-types) 
in clusters, and discuss the possible processes that cause this. 
Then, I will discuss also the role of the local density in shaping 
the mass distribution and I will show how the local environment is 
more important than the global one in influencing the mass function.