As I said in a recent blog, insects have a choice in inclement weather and will hunker down until things improve. Plants just get on with it, governed largely by day length. Of course some plants demand wet, or at least damp, conditions. Liverworts have no vessels for conducting fluids so they flourish in the rain. Furthermore, in sexual reproduction, the male organs produce cells which must 'swim' to the female organs (the archegonia) and require a film of liquid in order to do this.
Common Liverwort at the foot of a wall. Daventry town centre.
3 April, 2018