[en] Data published on studies of the atomic spectrum of Pu1 and Pu2 are reviewed in brief. Presented are data on wavelengths of all classified lines of a neutral atom of plutonium, their energy levels and electron configurations being also given. All data were obtained as a result of measuring wavelengths, the Zeeman splitting, isotopic shift and superfine structure. A summarized table of classified lines of Pu1 is presented, which contains 1420 lines in the range of 25000-3000 A. The table comprises all resonance and most typical intensive lines of a neutral plutonium atom