Mém. Soc. Sci. Nat. Cherbourg 5: 97 (1857).

Thallus: stout, terete, and commonly naked at the mostly simple base; dividing below the middle into a few elongated, rather simple, erectish, obsoletely tomentose branches, with often nodding tips. Granules (phyllocladia, Th. Fries) very small, globose, somewhat scattered, but becoming flat, and at length, especially on the branches, larger, crenate, and more densely heaped, glaucescent. Cephalodia sessile, ...

Note: Tuckerman (1861: 122) described Stereocaulon maderense from Madeira (Madeira Islands, Portugal) four years after Nylander. Who discovered that this is a synonym of S. azoreum?