sentences:  Observations of hundreds of plants across three habitat types found no evidence of climbing stems or upper pitchers in this species, suggesting that aerial traps are either very rare or absent altogether.It has been speculated that "N. mantalingajanensis" may produce upper pitchers only in deep shade or if provided with sufficient vegetation to support a climbing stem, as is the case with the closely related "N. deaniana" and "N. mira".