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We report the detection of a 110 MG cyclotron harmonic in the SDSS-spectrumof the magnetic cataclysmic variable (MCV) RX J1554.2+2721. This feature wasnoted earlier by others but remained unexplained. The wide spectral coverage ofthe new spectrum together with the earlier detection of a Zeeman split Ly-aline in a field of 144 MG makes the identification almost unambiguous. Wepropose to explain the non-conforming UV-optical photospheric temperature ofthe white dwarf by an as yet unobserved cyclotron component in the ultravioletwhich also could significantly contribute to the overall energy balance of theaccretion process.Comment: 4 pages, 3 figures, accepted for A&

A 110 MG cyclotron harmonic in the optical spectrum of RX J1554.2+2721