Fluorescence emission spectra (excitation wavelength, 440 nm) for “Ca. Chlorothrix halophila” (solid line), Chlorobium tepidum (dotted line), and Chloroflexus aurantiacus (dashed line) chlorosomes at room temperature (A) and 77 K (B). The chlorosome (BChl c) peaks are normalized. At room temperature “Ca. Chlorothrix halophila” chlorosomes emit fluorescence at a single wavelength, 776 nm. At 77 K, the chlorosome fluorescence becomes asymmetrical, with emission at 786 nm and a shoulder at around 820 nm.