Maybe Marcel Lecoufle does use some screwed-up (restyled) form of
"Nepenthes celebica" HOOK.F., DC.PROD.17:100 (1873) which is commonly
considered a synonym of _N.maxima_.
NB: For the professional horticulturist it is always nice if there are some
obsolete synonyms around because in this case he/she can sell the one plant
he/she has several times under different names! (No personal offense
intended, just general comment...)
Kind regards
Jan