On the cover Lagging behind the glow of Tiffany Blue – specimen of leafy liverwort Nowellia curvifolia (Dics.) Mitt., collected by Wiesław Fałtynowicz in Wigry National Park, Poland, observed under UV in fluorescent microscope. Blue fluorescence of the youngest parts of growing gametophyte is probably due to a dense cytoplasmic content of the cells. These contrast nicely with the berberine stained, amber cell walls of the older leaves and rhizoids.

[Author: Magdalena Turzańska]