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Structure of A. formosa and S. pistillata corallites septa, developed under different light spectra: T5 fluorescent lamps (T5), light emitting diode (LED) and light emitting plasma (LEP). Photosynthetically active radiation (PAR) was identical to all tested light spectra: 250±20 µmol quanta m−2 s−1. White arrows point septal microstructures, namely crystallites form and size distribution, as well as fibers growth orientation.
