Most collections listed in Tropicos as Campylopus pauper probably refer to var. pauper.
Keys from Frahm (1991).
1. Basal laminal cells rectangular; capsule oblong-cylindrical, strumose … var. pauper
1. Basal laminal cells short-rectangular to subquadrate; capsule ovoid, not strumose … var. lamprodictyon
Claves de Frahm (1991).
1. Células basales de la lámina rectangulares; cápsulas oblongo-cilíndricas, estrumosas … var. pauper
1. Células basalesde la lámina corto-rectangulares a subcuadradas; cápsulas ovoides, no estrumosas … var. lamprodictyon