Little is known about the life history of derbid planthoppers, some of which have been implicated as potential vectors of phytoplasmas. Among species of Cedusa, only the nymph and nymphal habitat of C. inflata (Ball) is currently known. Here we report fifth-instar nymphs of Cedusa hedusa McAtee, subsequently reared to adult, collected from mats of the moss Polytrichum commune Hedw. (Bryophyta: Polytrichaceae) in Alabama. We describe and illustrate the fifth instar and provide information on the nymphal habitat. Additional study is needed to determine if nymphs of C. hedusa feed on fungi within mats of P. commune or the moss itself, as well as oviposition sites and feeding preferences of the adults.