Plasma of glow hydrogen-cesium discharges of planotron and Penning types by spectroscopic methods is investigated. Element and charge plasma composition is determined. The hydrogen atom temperature is measured and the electron density in the plasma is estimated. Variation of the hydrogen, cesium and molybdenum (electrode material) atom densities and cesium ion density is detected during a discharge pulse with two-dimensional spatial resolution. It is found trapping cesium atom and ions and molybdenum atoms near the cathode surface. The discharge plasma emission energy in the visible range of spectra is measured. 8 refs., 13 figs.