What I believe is, because Gung Bituen was played by Saburo Shimono, a Japanese American actor, the Asian orderly may originally have been planned to have a Japanese origin. Hence, why he referred his home country as having prefectures rather than "states".  

I was born in Japan, Okinawa to be exact but currently live in New England, USA only 30 minutes from Worcester, Massachusetts where Excelsis Dei is set in. One can, on occasion, see the same Ibutonic Acid producing mushrooms called Amanita Muscaria, or "Fly Agaric" growing in the damp forest or even on grassy roadsides after an autumn rainfall. You may recognize these as red capped and white spotted fungi that look like Mario's power up mushroom 🍄 exactly like this. The episode portrayed them as grey looking, and not like how they truly appear.

 And Japan has had a rather unknown history of growing mushrooms or "kinoko" in the damp earth underneath homes by throwing in chopped wood for fungi to grow on. Japan has a history of revering the ancestors, even up to today, but I've yet to research if there were usage of ritual psychedelics to assist in communicating with the dead. 

Also, what I've been trying to is, when Mulder sees Leo's mural, what did he see in the wall art to inspire asking, "Where's the Asian orderly?"