Explanation of PL XH. 



Dendrobium eryiliroylossum, HAYATA. 



Fig. 1. The plant, 



2. A dorsal sepal., 



3. A lateral sepal. 



4. A petal. 



5. A labellum. 



6. Margin of the labellum. 



7. Column. 



8. Apical portion of the same, seen from back. 



9. Operculum, seen from side. 



10. The same, seen from back. 



11. Pollinia. 



