Follow the trail around to the right, passing a pile of fallen boulders, where it eventually becomes sturdier underfoot and leads you up to the Foo Alp. You will now enter a section of lovely rolling green pastures, which gently incline up to Foo pass, with the magnificent Glarner Alps visible on the horizon. The route will begin a very steep descent towards Elmer, before turning into a dirt road that leads you towards the valley through meadows, maple woods, past waterfalls and over a series of wooden bridges. As you reach Stäfellegg, the path begins to ascend to the Niderenalp cable car station, continuing to climb up to the day’s final destination: the quaint little village of Elm, formerly a hub for slate quarrying, and today a prime base for outdoors enthusiasts.

Sources http://www.via-alpina.org/en/page/246/the-green-trail https://www.summitpost.org/the-swiss-via-alpina/1010645 https://www.myswitzerland.com/en/destinations/elm/