SELECT (ST_Dump(foofoo.polycoll)).geom AS geomtextrep
FROM (SELECT ST_Polygonize(wkb_geometry) AS polycoll
FROM (SELECT wkb_geometry FROM the_table WHERE ST_GeometryType(wkb_geometry) = 'ST_LineString') AS foo) AS foofoo;

result, dangles, cuts, invalids = polygonize_full(lines)

GEOSPolygonize_full - Returns polygons, dangles, cuts, invalid rings
GEOSPolygonize - Returns only polygons