check Kew's World Checklist of selected plant families, they list it as a separate species.
Gastrochilus japonicus is native to Japan and Taiwan
Gastrochilus somae is native to Yunnan province in the south (inland) part of China.
it appears that it was recently classified as a seperate species - the reference given is from 2010
Jin, X.H., Dai, Z.Q., Liu, Q.Y. & Ju, X.Y. (2010). Miscellaneous taxonomic notes on Orchidaceae from China. Acta Botanica Yunnanica 32: 331-323
I still don't know what the difference is between the two species, I'd have to find a copy of that article.
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