grassetto = Testo principale
  Cap.        grigio = Testo di commento
1     IX(90) |             Pringsheim’s Jahrbuch für wissenschaft. Botanik,
2      X     |      Secondo Hildebrand (Jahrbuch für w. Botanik, B. xii p.
3      X(160)| von Infusorien, Morphol. Jahrbuch, e il dott. Dodel, Die Kraushaar-Alge,
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