Continuing up along the valley floor, the Mercatorum Way then enters the municipality of Serina. The route avoids the provincial road, crossing river Serina just above Rosolo and climbing up the left bank on an old mule track immersed in woodland. After moving higher, the path leaves the woods in the outskirts of the hamlet of Bagnella, and then follows the asphalted municipal road until it enters the main town. At Serina, the low-altitude variant of the Mercatorum Way joins the high-altitude variant arriving from Trafficanti, before continuing towards the Crocetta Pass and Dossena.