This terrestrial fern  has a short creeping rhizome that is covered in black scales and forms a leafy clump. It has divided  upright spreading mid green fronds and the fertile fronds are vertical and release spores during summer.

Hardiness zones 8 to 11

Blechnum cartilagineum is found in Australia growing along the east coast along watercourses in rainforests and in moist wooded areas on the coast and in the lower mountains. It is often associated with rocks and humus rich soil and prefers a shaded wind protected position and is frost tolerant but drought tender. 

The Gristle-fern is grown for its foliage and clumping habit. It is planted in small gardens along shaded borders or in a rockery. It is also grown in patio pots and planter boxes and is commonly used around a water feature. It is moisture loving and fast growing establishing in 2 years and is planted in the understorey in a rainforest setting. ID 661

Blechnum (BLEK-num) cartilagineum (car-till-a-gin-um)

Blechnaceae (blek-NAY-see-ee)