Population genetic analyses were conducted on the endemic Hawaiian fern Sadleria cyatheoides (Blechnaceae) using Amplified Fragment Length Polymorphisms (AFLPs). Populations were examined to reveal levels and patterns of genetic diversity within and among populations and within and among islands of the Hawaiian archipelago. DNA was extracted from frozen isozyme grindate and utilized in the AFLP technique to allow greater discrimination between individuals. When compared to data obtained for the same individuals with isozyme electrophoresis, finer patterns of genetic structure were evident with AFLPs.

Key words: Blechnaceae