1. S. Hayashi andA. Matsuo, Experientia25, 1139 (1969).—A. Matsuo, Tetrahedron27, 2757 (1971).
2. V. Benesova, P. Sedmera, V. Herout andF. Sorm, Tetrahedron Lett.1971, 2679.
3. N. H. Andersen, C. R. Costin, C. M. Kramer, Y. Ohta andS. Huneck, Phytochemistry, submitted for publication.
4. Frullania dilatata produces an enantiomeric santonin-related lactone7;Scapania species produce (-)-longifolene8.
5. S. Huneck, Institut für Biochemie der Pflanzen der Akademie der Wissenschaften der DDR, Halle/Saale (DDR).