From Battisti Mountain Hut 1,751m 612835E-4902132N, trail 615 climbs northwards along the marly slope separating Ozola and Dolo valleys. Once you reach the small lake (dry during the summer) immediately before Passone (1,839m 613399E-4002833N, 0.20), cross on the left the creek and take trail 607, heading for the big grassy hillock of Piella (meaning in the past "fir tree", extinct in the area since long).
Further information1 lap of: From Garfagnana to Bismantova