1. Systematics of the Pleurothallidinae.

2. Systematics of Masdevallia.

3. Systematics of Pleurothallis.

4. Systematics of Acostaea, Condylago and Porroglossum.

5. Systematics of Dresslerella and Scaphosepalum.

v. 6. Systematics of Pleurothallis subgenus Ancipitia subgenus Scapula and Trisatella.

v. 7. Systematics of Platystele.

v. 8. Systematics of Lepanthopsis Octomeria subgenus Pleurothallopsis, Restrepiella, Restrepiopsis, Salpistele and Teaguela.

v. 9. Systematics of Myoxanthus.

v. 10. Systematics of Dracula

v. 11. Systematics of Lepanthes subgenus Brachycladium and Pleurothallis subgenus Aenigma subgenus Elongatia subgenus Kraenzlinella.

v. 13. Systematics of Restrepia (Orchidaceae)

v. 14. Systematics of Draconanthes Lepanthes subgenus Marsipanthes and subgenus Lepanthes of Ecuador

v. 15. Systematics of Trichosalpinx

v. 16. Systematics of Pleurothallis

v. 17. Systematics of subgen. Pleurothallis, sect. Abortivae, sect. Truncatae, sect. Pleurothallis, subsect. Acroniae, subsect. Pleurothallis, subgen. Dractontia, subgen. Unciferia, addenda to Dracula, Lepanthes, Masdevallia Porroglossum and Scaphosepalum (Orchidaceae)

v. 18. Systematics of Pleurothallis, subgen. Pleurothallis, sect. Pleurothallis, subsect. Antenniferae,subsect. Longiracemosae, subsect. Macrophyllaeracemosae, subsect. Perplexae, subgen. Pseudostelis, subgen. Acuminatia, addenda to Dracula, Lepanthes, Masdevallia and Pleurothallis, miscellaneous new species of Dryadella, Lepanthes and Pleurothallis

v. 19. Systematics of Masdevallia, pt. 1

v. 20. Systematics of Jostia, Andinia, Barbosella, Barbrodria, Pleurothallis, subgen. Antilla, subgen. Effusia, subgen. Restrepioidia, addenda to Lepanthes, Masdevallia, Platystele, Pleurothallis, Restrepiopsis, Scaphosephalum and Teagueia

v. 21. Systematics of Masdevallia (pt. 2)

v. 22. Systematics of Masdevallia (pt. 3)

v. 23. Systematics of Masdevallia (pt. 4)

v. 24. A first century of new species of Stelis of Ecuador (pt. 1)

v. 25. Systematics of Masdevallia (pt. 5)

v. 26. A second century of new species of Stelis of Ecuador, Epibator, Ophidion Zootrophion.