Explanation of PI. XL 



Microstylis arisanensls HAYATA. 



Fig. 1. The plant. 



2. A flower. 



3. A dorsal sepal. 



4. A lateral sepal. 



5. A petal. 



6. A labellum. 



7. The same, seen from side. 



8. The same, in cross section. 



9. Column. 



10. The same, seen from side. 



11. A pollininm. 



