often almost tussock-forming in the wild, 15-25cm tall. Leaves deciduous, triangular-ovate in outline, tripinnate, bright green, the fertile fronds a little taller than the sterile ones. Europe and Asia, in screes and on rocky hillsides. C.c. var. sitchense has broadly triangular leaf blades. Alaska. For C.c. var. or subsp. acrostichoides, see C. acrostichoides.