Two characteristic sets of single-cell fluorescence spectra for Spirulina platensis CALU 550 and Merismopedia punctata CALU 666. The excitation wavelengths (405, 458, 476, 488, 496, 514 nm) are given over the curves. All spectra are normalized to the maximum intensity and shifted along x-axis for convenience of observation. The dashed lines indicate fluorescence maxima of the individual pigments (PE – 580 nm; PC – 656 nm; Chl a – 682, 715 nm).