[R-sig-Geo] shp file with 2 types of bodies (water and forest)

[Baptiste Coulmont]

I would like to map the forests in green and the water bodies in blue :

summary(nature)

Object of class SpatialPolygonsDataFrame
Coordinates:
        min       max
r1  2.560776  6.403847
r2 49.493613 51.505419
Is projected: FALSE
proj4string : [+proj=longlat]
Data attributes:
                          NAME           TYPE
 Dijle                       :   43   forest:6830
 Schelde                     :   30   water :6564
 Ringselven                  :   17
 Albertkanaal                :   15
 Westelijke Rijkswaterleiding:   14
 (Other)                     :  990
 NA's                        :12285

How do I ask R to map, for example, only the forests ?