SCHEMA:
CREATE TABLE table_11727969_1 (species_in_the_peruvian_amazon INTEGER, taxonomy VARCHAR)
USER:
what's the minimum species in the peruvian amazon with taxonomy s fern ( pteridophyta )

QUERY:
SELECT MIN(species_in_the_peruvian_amazon) FROM table_11727969_1 WHERE taxonomy = "s Fern ( Pteridophyta )"