In 1999, an article by Bruce Salmon entitled Nepenthes mollis (Nepenthaceae)—Rediscovered? was published in the Carnivorous Plant Newsletter. In the article, Salmon describes male specimens of an unidentified Nepenthes species, referred to as N. sp., collected on Mount Lumarku at an altitude of 1,700 m in tall dense forest on an exposed ridge line. Based on close morphological similarities and plausible geographical overlap, he suggests that the unidentified taxon may represent N. mollis. Salmon compares the two as follows: