Pleurothallis subgenus Acianthera and three allied subgenera ; A second century of new species of Stelis of Ecuador ; Epibator, Ophidion, Zootrophion ; Addenda to Brachionidium, Dracula, Lepanthes, Platystele, Pleurothallis, Porroglossum, and Masdevallia ; New genera and combinations