Cystopteris fragilis
A widespread species throughout most of the United States, except the southeast. Similar to Cystopteris tenuis and Cystopteris reevesiana.
Plant habit on the south side of Frenchman Reservoir, north of Chilcoot, California, 26 May 2009.
Abaxial view of a pinna showing sori, north of Chilcoot, 26 May 2009.
Adaxial view of a pinna, north of Chilcoot, 26 May 2009.