[en] Plane wave propagation in temperate plasmas consisting of n ion species is calculated. Analytical results are given for collisionless n species plasmas of arbitrary composition. Refractive index and damping are calculated numerically for plasmas including collisions of any kind and at arbitrary angles of propagation. At angles other than 90⁰ to the externally applied magnetic field there are two simultaneously propagating waves showing resonances at the cyclotron frequencies of the ions involved, and being separated by n-1 ion-ion-hybrid cutoffs. Strong particle coupling through high ion collision rates reduces the n cyclotron resonances to new combined, mass weighted and frequency shifted cyclotron resonance frequencies. In the ion cyclotron frequency range one wave will propagate at right angle to the external magnetic field showing n-1 ion-ion-hybrid resonances and n-1 hybrid cutoffs. The hybrid resonance frequencies lie close to the cyclotron frequencies of the minority ions. In the neighbourhood of the resonances, the ion collisions affect damping of the wave considerably more than electron collisions. (orig.)