Key points are not available for this paper at this time.
Preface Acknowledgements Introduction 1. Examination of material 2. Measurements 3. Use of keys 4. Nomenclature and taxonomy 5. Taxonomic categories 6. Frequency and distribution 7. Illustrations and descriptions 8. Conspectus of classification 9. Hepaticae: Artificial key to orders (including Anthocerotae), Calobryales, Jungermanniales 10. Artificial key to families of Jungermanniales, Metzgeriales 11. Artificial key to families of Metzgeriales, Sphaerocarpales, Marchantiales 12. Artificial key to families of Marchantiales 13. Anthocerotae Glossary Bibliography Index.
Perry et al. (Sun,) studied this question.