[Effect of terpenoid derivatives (helminthosporol, helminthosporic acid, dihydrohelminthosporic acid, and steviol) on antheridinum induction in Anemia phyllitidis].

Helminthosporol, helminthosporic acid, dihydrohelminthosporic acid, and steviol have been tested for their ability to induce antheridium formation in Anemia phyllitidis. All helminthosporol derivatives posses a limited but real activity. Steviol proved to be inactive.All the substance tested have a significant effect on the cell division rate of the prothallia.