1	"Stem leaves deltoid-triangular with a somewhat cordate base, abruptly narrowed near the leaf middle into a long acumen; alar cells forming a large group in the cordate base"	"Palustriella commutata"
1	"Stem leaves lanceolate and falcate, gradually narrowed from near the base to the long acuminate apex; alar cells forming a small group to 5 cells long at margin"	"Palustriella falcata"