Table schema:
CREATE TABLE table_11727969_1 (species_in_the_peruvian_amazon INTEGER, taxonomy VARCHAR)

Question: what's the minimum species in the peruvian amazon with taxonomy s fern ( pteridophyta )
SQL: SELECT MIN(species_in_the_peruvian_amazon) FROM table_11727969_1 WHERE taxonomy = "s Fern ( Pteridophyta )"