Kingdom: Plantas
Division: Bryophyta
Subdivision: Bryophytina
Class: Bryopsida
Order: Polytrichales
Family: Polytrichaceae
Genus: Atrichum
Common name: Slender smoothcap
Species name: Atrichum tenellum (Rohl.) Bruch et Schimp.
Azorean endemic: No
Coordinator: Rosalina Gabriel