Pulu

Webster's Dictionary

(n.) A vegetable substance consisting of soft, elastic, yellowish brown chaff, gathered in the Hawaiian Islands from the young fronds of free ferns of the genus Cibotium, chiefly C. Menziesii; - used for stuffing mattresses, cushions, etc., and as an absorbent.

The Nuttall Encyclopedia

A kind of silk obtained from the fibres of a fern-tree of Hawaii.